{"id":4740,"date":"2025-05-14T11:59:39","date_gmt":"2025-05-14T11:59:39","guid":{"rendered":"https:\/\/www.arysontechnologies.com\/blog\/?p=4740"},"modified":"2026-03-16T13:40:19","modified_gmt":"2026-03-16T13:40:19","slug":"fix-slow-outlook-performance-issues-caused-by-large-pst-file-size","status":"publish","type":"post","link":"https:\/\/www.arysontechnologies.com\/blog\/fix-slow-outlook-performance-issues-caused-by-large-pst-file-size\/","title":{"rendered":"Troubleshooting Slow Outlook Performance due to Large PST File"},"content":{"rendered":"<div class=\"block_sum mb-3\"><em><strong>Summary:- <\/strong>If your Outlook is running slow and taking a long time to open, we understand how frustrating it is. One of the most common reasons for this problem is a large PST file. Over time, as you send and receive more emails, your Outlook data file grows bigger. When it gets too large, it can slow down the entire program and create Outlook PST file performance issues. Moreover, it can lead to PST file corruption. In this blog, we will discuss the best methods, from basic cleanup methods to advanced <a href=\"https:\/\/www.arysontechnologies.com\/split-pst-file.html\"><strong>Split PST Software<\/strong><\/a>.<\/em>\n<div class=\"row justify-content-center mac-win-tab\">\n<div class=\"col-md-6\">\n<ul id=\"myTab\" class=\"nav nav-tabs justify-content-center border-primary\" role=\"tablist\">\n<li class=\"nav-item\" role=\"presentation\"><button id=\"home-tab\" class=\"nav-link bg-transparent px-4 active\" role=\"tab\" type=\"button\" data-toggle=\"tab\" data-target=\"#home\" aria-controls=\"home\" aria-selected=\"true\"><i class=\"icon-windows\"><\/i> Windows<\/button><\/li>\n<li class=\"nav-item\" role=\"presentation\"><button id=\"profile-tab\" class=\"nav-link bg-transparent px-4\" role=\"tab\" type=\"button\" data-toggle=\"tab\" data-target=\"#profile\" aria-controls=\"profile\" aria-selected=\"false\"><i class=\"icon-apple\"><\/i>Mac<\/button><\/li>\n<\/ul>\n<div id=\"myTabContent\" class=\"tab-content\">\n<div id=\"home\" class=\"tab-pane fade active show\" role=\"tabpanel\" aria-labelledby=\"home-tab\"><span class=\"block_btn\"><a class=\"custom-download-btn\" href=\"https:\/\/www.arysontechnologies.com\/demo-version\/Aryson-PST-Split-Demo.exe\"><i class=\"icon-windows\"><\/i> Download Now<\/a>\u00a0\u00a0<a class=\"custom-buy-btn\" href=\"https:\/\/www.arysontechnologies.com\/split-pst\/order-now.php\n\"><i class=\"icon-basket\"><\/i> Purchase Now<\/a><\/span><\/div>\n<div id=\"profile\" class=\"tab-pane fade\" role=\"tabpanel\" aria-labelledby=\"profile-tab\"><span class=\"block_btn\"><a class=\"custom-download-btn\" href=\"https:\/\/www.arysontechnologies.com\/demo-version\/Aryson-PST-Splitter_for-MAC.dmg\"><i class=\"icon-apple\"><\/i> Download Now<\/a>\u00a0\u00a0<a class=\"custom-buy-btn\" href=\"https:\/\/www.arysontechnologies.com\/mac\/pst-split\/buy-now.php\"><i class=\"icon-basket\"><\/i> Purchase Now<\/a><\/span><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_83 counter-hierarchy ez-toc-counter ez-toc-light-blue ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.arysontechnologies.com\/blog\/fix-slow-outlook-performance-issues-caused-by-large-pst-file-size\/#What_Is_a_PST_File\" >What Is a PST File?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.arysontechnologies.com\/blog\/fix-slow-outlook-performance-issues-caused-by-large-pst-file-size\/#Causes_of_Outlook_PST_File_Performance_Issues\" >Causes of Outlook PST File Performance Issues<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.arysontechnologies.com\/blog\/fix-slow-outlook-performance-issues-caused-by-large-pst-file-size\/#How_to_Check_PST_File_Size\" >How to Check PST File Size?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.arysontechnologies.com\/blog\/fix-slow-outlook-performance-issues-caused-by-large-pst-file-size\/#How_to_Optimize_Outlook_PST_File_Performance_Issues\" >How to Optimize Outlook PST File Performance Issues?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.arysontechnologies.com\/blog\/fix-slow-outlook-performance-issues-caused-by-large-pst-file-size\/#Method_01_Remove_Deleted_Item_Folder_to_Fix_Outlook_Slow_Due_to_Large_PST\" >Method 01: Remove Deleted Item Folder to Fix Outlook Slow Due to Large PST<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.arysontechnologies.com\/blog\/fix-slow-outlook-performance-issues-caused-by-large-pst-file-size\/#Method_02_Compact_PST_File_for_Better_Outlook_Performance\" >Method 02: Compact PST File for Better Outlook Performance<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.arysontechnologies.com\/blog\/fix-slow-outlook-performance-issues-caused-by-large-pst-file-size\/#Method_03_Transfer_Old_PST_File_Data_to_New_PST_File\" >Method 03: Transfer Old PST File Data to New PST File<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.arysontechnologies.com\/blog\/fix-slow-outlook-performance-issues-caused-by-large-pst-file-size\/#Method_04_Use_Mailbox_Cleanup_to_Fix_Outlook_PST_File_Performance_Issues\" >Method 04: Use Mailbox Cleanup to Fix Outlook PST File Performance Issues<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.arysontechnologies.com\/blog\/fix-slow-outlook-performance-issues-caused-by-large-pst-file-size\/#Method_05_Reduce_PST_File_Size_Outlook_Using_ImportExport_Feature\" >Method 05: Reduce PST File Size Outlook Using Import\/Export Feature<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.arysontechnologies.com\/blog\/fix-slow-outlook-performance-issues-caused-by-large-pst-file-size\/#Limitations_of_the_Manual_Method\" >Limitations of the Manual Method<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.arysontechnologies.com\/blog\/fix-slow-outlook-performance-issues-caused-by-large-pst-file-size\/#Method_06_Professional_Tool_to_Optimize_Outlook_PST_File_Performance_Issue\" >Method 06: Professional Tool to Optimize Outlook PST File Performance Issue<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.arysontechnologies.com\/blog\/fix-slow-outlook-performance-issues-caused-by-large-pst-file-size\/#Advanced_features_of_this_Tool\" >Advanced features of this Tool:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.arysontechnologies.com\/blog\/fix-slow-outlook-performance-issues-caused-by-large-pst-file-size\/#Steps_to_Split_Large_PST_file_Outlook\" >Steps to Split Large PST file Outlook<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.arysontechnologies.com\/blog\/fix-slow-outlook-performance-issues-caused-by-large-pst-file-size\/#Conclusion\" >Conclusion<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.arysontechnologies.com\/blog\/fix-slow-outlook-performance-issues-caused-by-large-pst-file-size\/#Frequently_Asked_Questions\" >Frequently Asked Questions<\/a><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"What_Is_a_PST_File\"><\/span>What Is a PST File?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A <strong>PST (Personal Storage Table)<\/strong> file is where Outlook stores all your emails, attachments, calendar events, contacts, and more. Every time you send or receive an email, the PST file grows in size. Over time, this file can become very large, especially if you don\u2019t delete old emails to reduce PST file size Outlook.<\/p>\n<div class=\"also-read\">\n<h3 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Causes_of_Outlook_PST_File_Performance_Issues\"><\/span>Causes of Outlook PST File Performance Issues<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Several factors can slow down Outlook performance. Some of the main reasons are:<\/p>\n<ul>\n<li>When the PST file exceeds the recommended size (usually over 10 GB).<\/li>\n<li>Large or numerous email attachments increase the file size quickly.<\/li>\n<li>Older versions may not handle large PST files as well as newer ones.<\/li>\n<li>Not emptying the Deleted Items folder or archiving old emails.<\/li>\n<li>Moreover, if the file gets damaged, it can slow down or even crash Outlook.<\/li>\n<\/ul>\n<h3 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"How_to_Check_PST_File_Size\"><\/span>How to Check PST File Size?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>If you want to <a href=\"https:\/\/www.arysontechnologies.com\/blog\/fix-oversized-pst-file-issue-in-outlook-2016-2013\/\"><strong>repair oversized PST file Outlook<\/strong><\/a>, first find out what the size of your PST file is. To check your PST file size, follow the steps below:<\/p>\n<ol>\n<li>Firstly, open <strong>Outlook<\/strong> on your computer.<\/li>\n<li>Next, click on <strong>File <\/strong>and choose <strong>Account Settings<\/strong>.<\/li>\n<li>Again, select <strong>Account Settings <\/strong>and choose the <strong>Data Files<\/strong> option.<\/li>\n<li>After that, select your <strong>Data file<\/strong> and click <strong>Open File Location<\/strong>.<\/li>\n<li>Lastly, right-click the file and choose <strong>Properties <\/strong>to see the file size.<\/li>\n<\/ol>\n<\/div>\n<h2 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"How_to_Optimize_Outlook_PST_File_Performance_Issues\"><\/span>How to Optimize Outlook PST File Performance Issues?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>To improve Outlook&#8217;s performance, you need to <a href=\"https:\/\/www.arysontechnologies.com\/blog\/reduce-outlook-mailbox-size-in-easy-steps\/\"><strong>reduce the size of your Outlook Mailbox without deleting<\/strong><\/a>. Below, we discuss the top six methods to reduce. The 5 methods are manual, and the last one is a professional method. The professional tool is the instant and hassle-free solution. Let&#8217;s explore all the methods one by one and get a better output.<\/p>\n<h3 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Method_01_Remove_Deleted_Item_Folder_to_Fix_Outlook_Slow_Due_to_Large_PST\"><\/span>Method 01: Remove Deleted Item Folder to Fix Outlook Slow Due to Large PST<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>In MS Outlook, when you delete an email, it goes into the Deleted Items Folder. Still, it consumes space in your PST file and affects your Outlook performance. So, follow the steps below to permanently remove deleted emails.<\/p>\n<ol>\n<li>Again, go to <strong>Outlook <\/strong>and right-click on the <strong>Deleted Items folder.<\/strong><\/li>\n<li>Lastly, click on <strong>Empty Folder<\/strong> to permanently delete them.<\/li>\n<\/ol>\n<h3 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Method_02_Compact_PST_File_for_Better_Outlook_Performance\"><\/span>Method 02: Compact PST File for Better Outlook Performance<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>After permanently deleting emails, Outlook still holds the file space until you compress it. You can also try <a href=\"https:\/\/www.arysontechnologies.com\/compress-outlook-pst\/\"><strong>Aryson PST Compress Tool<\/strong><\/a> that can easily compact size of your Outlook mailbox without Outlook installation or try manual methods which is given below:<\/p>\n<p><strong>Note<\/strong>: You may not see a huge change in file size right away, but the space becomes available for new data.<\/p>\n<p>Steps to use the compact now feature:<\/p>\n<ol>\n<li>Again, open <strong>Outlook<\/strong> and go to <strong>File<\/strong>. Choose <strong>Account Settings<\/strong>.<\/li>\n<li>Then, select the <strong>Account Settings<\/strong> option and choose the <strong>Data File<\/strong> tab.<\/li>\n<li>After that, select your <strong>Data file<\/strong> and press <strong>Settings<\/strong>.<\/li>\n<li>In the end, choose the<strong> Compact Now<\/strong> option and click<strong> OK<\/strong>.<\/li>\n<\/ol>\n<h3 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Method_03_Transfer_Old_PST_File_Data_to_New_PST_File\"><\/span>Method 03: Transfer Old PST File Data to New PST File<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The process of moving your PST file data to a new PST file helps you to clean up storage space. Here is how you can perform it:<\/p>\n<ol>\n<li>In <strong>MS Outlook<\/strong> and go to <strong>Account Settings<\/strong>, and again select <strong>Account Settings<\/strong>.<\/li>\n<li>Then, select <strong>Data File<\/strong> and click <strong>Add<\/strong> to create a new PST file.<\/li>\n<li>Enter the <strong>name and location<\/strong> of your new PST file. Click <strong>OK.<\/strong><\/li>\n<li>After that, select the <strong>email<\/strong> that you want to transfer.<\/li>\n<li>Right-click on that <strong>data <\/strong>and choose the <strong>Move <\/strong>option.<\/li>\n<li>Then, click on <strong>Other Folder <\/strong>and select the items to move. Click <strong>OK<\/strong>.<\/li>\n<\/ol>\n<h3 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Method_04_Use_Mailbox_Cleanup_to_Fix_Outlook_PST_File_Performance_Issues\"><\/span>Method 04: Use Mailbox Cleanup to Fix Outlook PST File Performance Issues<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The Outlook also provides a <strong>Mailbox Cleanup<\/strong> feature to reduce the size of your PST file. Follow the steps to use the <strong>Compact Now<\/strong> feature.<\/p>\n<ol>\n<li>In Outlook, click on <strong>File<\/strong> and choose the<strong> Tools<\/strong> option.<\/li>\n<li>Then, select the <strong>Mailbox Cleanup<\/strong> option.<\/li>\n<li>Now, you will see the different options to help you free up storage space.<\/li>\n<li>Select options as per your requirements and click on <strong>Delete<\/strong>.<\/li>\n<li>Finally, click on <strong>View Conflicts Size<\/strong> to remove any alternative versions of the items.<\/li>\n<\/ol>\n<h3 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Method_05_Reduce_PST_File_Size_Outlook_Using_ImportExport_Feature\"><\/span>Method 05: Reduce PST File Size Outlook Using Import\/Export Feature<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The <strong>Import\/Export feature<\/strong> allows you to reduce the size of the PST file. It doesn&#8217;t split the PST file; instead, it creates backups of older data and transfers them into a newly created PST file. Follow the steps to perform it:<\/p>\n<ol>\n<li>In Outlook, again, click on<strong> File<\/strong> and choose the <strong>Account Settings<\/strong> option.<\/li>\n<li>Click on the <strong>Data File<\/strong> tab and select <strong>Add to create a new file.<\/strong><\/li>\n<li>Then, specify the <strong>name and location<\/strong> for your new PST folder.<\/li>\n<li>The newly<strong> created PST file<\/strong> will be visible under the Data File tab.<\/li>\n<li>Again, click on <strong>File<\/strong> and choose the <strong>Open &amp; Export<\/strong> option.<\/li>\n<li>Then, select the <strong>Import\/Export<\/strong> and <strong>Export to a File<\/strong>. Click <strong>Next<\/strong>.<\/li>\n<li>After that, choose <strong>Outlook Data File<\/strong> and press <strong>Next<\/strong>.<\/li>\n<li>Select the <strong>specific folder <\/strong>or the <strong>entire folder<\/strong> to export.<\/li>\n<li>Finally, click on <strong>Browse<\/strong> to choose the <strong>location<\/strong> and then click <strong>Finish<\/strong>.<\/li>\n<\/ol>\n<h4 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Limitations_of_the_Manual_Method\"><\/span>Limitations of the Manual Method<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>Above all, the manual methods are free to use and good for basic cleanup. But, they have some limitations, such as:<\/p>\n<ul>\n<li>They can be time-consuming, especially if you have a large PST file.<\/li>\n<li>Increase the risk of compromising data formatting, integrity, and availability.<\/li>\n<li>They do not provide the option to <a href=\"https:\/\/www.arysontechnologies.com\/blog\/how-to-split-outlook-pst-file\/\">split a large or oversized PST file<\/a> by using a date range.<\/li>\n<\/ul>\n<p>To avoid these limitations, you can use the alternative method mentioned below.<\/p>\n<h3 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Method_06_Professional_Tool_to_Optimize_Outlook_PST_File_Performance_Issue\"><\/span>Method 06: Professional Tool to Optimize Outlook PST File Performance Issue<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The <strong>Aryson PST Splitter Software<\/strong> is a reliable and effective solution to reduce your PST file size. It splits your large or oversized PST files into smaller parts based on Size, Date, Sender, and Folders. You can also split multiple PST files at once using this top-notch utility. It also offers a feature to set a password on the resultant file. Additionally, this tool provides an option to remove duplicate data to free up storage space. Similarly, it offers multiple advanced features such as:<\/p>\n<h4 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Advanced_features_of_this_Tool\"><\/span>Advanced features of this Tool:<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<ul>\n<li>It maintains the folder hierarchy of the original PST file during the splitting process.<\/li>\n<li>This utility is designed with an advanced algorithm that provides high speed and 100% accurate results.<\/li>\n<li>Also, provide a Date filter for transferring only selective emails based on start and End dates.<\/li>\n<li>There is no need to run Outlook on your system while performing, and it gives a hassle-free solution.<\/li>\n<li>With its simple and user-friendly interface, both tech and non-tech users can easily perform the splitting process.<\/li>\n<li>Fully compatible with all Outlook and Windows versions, like Windows 11, 10, 9, 8, etc.<\/li>\n<\/ul>\n<h4 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Steps_to_Split_Large_PST_file_Outlook\"><\/span>Steps to Split Large PST file Outlook<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<ol>\n<li>Firstly, launch the <strong>Aryson Split PST Tool<\/strong> on your system.<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-4743\" src=\"https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2025\/05\/1-1.jpg\" alt=\"Run Aryson Split PST Tool\" width=\"600\" height=\"466\" srcset=\"https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2025\/05\/1-1.jpg 600w, https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2025\/05\/1-1-300x233.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/li>\n<li>Now, choose <strong>Add Files <\/strong>or <strong>Add Folder<\/strong> to select the PST file and click<strong> Next<\/strong>.<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-4744\" src=\"https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2025\/05\/2-1.jpg\" alt=\"select the PST file and click Next\" width=\"600\" height=\"466\" srcset=\"https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2025\/05\/2-1.jpg 600w, https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2025\/05\/2-1-300x233.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/li>\n<li>After that, <strong>preview and select<\/strong> the PST file to split.<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-4745\" src=\"https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2025\/05\/3-1.jpg\" alt=\"preview and select the PST file to split\" width=\"600\" height=\"466\" srcset=\"https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2025\/05\/3-1.jpg 600w, https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2025\/05\/3-1-300x233.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/li>\n<li>Then, choose different options to split, like <strong>Split PST by Size, Date, Sender,<\/strong> and <strong>Folder<\/strong>. Press <strong>Next<\/strong>.<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-4746\" src=\"https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2025\/05\/4-1.jpg\" alt=\"Split PST by Size, Date, Sender\" width=\"600\" height=\"466\" srcset=\"https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2025\/05\/4-1.jpg 600w, https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2025\/05\/4-1-300x233.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/li>\n<li>Lastly, apply <strong>Advanced features<\/strong> according to your requirements. Click <strong>Split.<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-4747\" src=\"https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2025\/05\/5-1.jpg\" alt=\"Click Split\" width=\"600\" height=\"466\" srcset=\"https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2025\/05\/5-1.jpg 600w, https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2025\/05\/5-1-300x233.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/strong><\/li>\n<\/ol>\n<h3 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>A large or oversized PST file can generate Outlook PST file performance issues. Thus, it becomes a necessary step to reduce the size of your large PST file. Above, we explained various methods to perform this process. The manual methods are free to use and have some limitations. Therefore, many users prefer to directly use the recommended tool. It is easy to use and provides a hassle-free result. Furthermore, the try (Demo) version of this utility is available to split 50 emails per folder.<\/p>\n<h4 class=\"faq-main_heading\"><span class=\"ez-toc-section\" id=\"Frequently_Asked_Questions\"><\/span>Frequently Asked Questions<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1747223827250\"><strong class=\"schema-faq-question\"><strong>Q1. What can I do when my PST file is too large?<\/strong><\/strong> <p class=\"schema-faq-answer\"><strong>Ans:<\/strong> You can split your large PST file into smaller parts with the help of <strong>Aryson Split PST Software<\/strong>. It splits all your data into smaller parts based on several criteria like Date, Folder, Size, and Sender.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1747223876455\"><strong class=\"schema-faq-question\"><strong>Q2. Can I fix a large PST file without losing any data?<\/strong><\/strong> <p class=\"schema-faq-answer\"><strong>Ans:<\/strong> Yes, there are several ways to reduce the size of your PST file without losing any data. You can delete old emails, empty the Deleted Items folder, compact the file, or even split the large PST file.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1747223904040\"><strong class=\"schema-faq-question\"><strong>Q3. Is it possible to split a large PST file by date or sender?<\/strong><\/strong> <p class=\"schema-faq-answer\"><strong>Ans:<\/strong> Yes, with specialized software, you can split a large PST file based on different criteria like date range or sender. This makes it easier to manage and find older emails.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1747223926959\"><strong class=\"schema-faq-question\"><strong>Q4. Will splitting my PST file affect my email organization?<\/strong><\/strong> <p class=\"schema-faq-answer\"><strong>Ans: <\/strong>No, when you split a PST file using the recommended tool. It maintains your folder structure and organizes your emails just as they were in the original file.<\/p> <\/div> <\/div>\n\n\n<div class=\"kk-star-ratings kksr-auto kksr-align-left kksr-valign-bottom\"\n    data-payload='{&quot;align&quot;:&quot;left&quot;,&quot;id&quot;:&quot;4740&quot;,&quot;slug&quot;:&quot;default&quot;,&quot;valign&quot;:&quot;bottom&quot;,&quot;ignore&quot;:&quot;&quot;,&quot;reference&quot;:&quot;auto&quot;,&quot;class&quot;:&quot;&quot;,&quot;count&quot;:&quot;2&quot;,&quot;legendonly&quot;:&quot;&quot;,&quot;readonly&quot;:&quot;&quot;,&quot;score&quot;:&quot;5&quot;,&quot;starsonly&quot;:&quot;&quot;,&quot;best&quot;:&quot;5&quot;,&quot;gap&quot;:&quot;5&quot;,&quot;greet&quot;:&quot;Rate this post&quot;,&quot;legend&quot;:&quot;5\\\/5 - (2 votes)&quot;,&quot;size&quot;:&quot;24&quot;,&quot;title&quot;:&quot;Troubleshooting Slow Outlook Performance due to Large PST File&quot;,&quot;width&quot;:&quot;142.5&quot;,&quot;_legend&quot;:&quot;{score}\\\/{best} - ({count} {votes})&quot;,&quot;font_factor&quot;:&quot;1.25&quot;}'>\n            \n<div class=\"kksr-stars\">\n    \n<div class=\"kksr-stars-inactive\">\n            <div class=\"kksr-star\" data-star=\"1\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"2\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"3\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"4\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"5\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n    <\/div>\n    \n<div class=\"kksr-stars-active\" style=\"width: 142.5px;\">\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n    <\/div>\n<\/div>\n                \n\n<div class=\"kksr-legend\" style=\"font-size: 19.2px;\">\n            5\/5 - (2 votes)    <\/div>\n    <\/div>\n","protected":false},"excerpt":{"rendered":"<p>Summary:- If your Outlook is running slow and taking a long time to open, we understand how frustrating it is.<a class=\"read-more ml-1 main-read-more\" href=\"https:\/\/www.arysontechnologies.com\/blog\/fix-slow-outlook-performance-issues-caused-by-large-pst-file-size\/\">Read More<\/a><\/p>\n","protected":false},"author":2,"featured_media":4741,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[139],"tags":[],"class_list":["post-4740","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-outlook"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Fix Slow Outlook Performance Caused by Large PST File Size<\/title>\n<meta name=\"description\" content=\"Fix slow Outlook performance caused by large PST files size. Learn troubleshooting tips to boost speed and optimize email workflow today!\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.arysontechnologies.com\/blog\/fix-slow-outlook-performance-issues-caused-by-large-pst-file-size\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Fix Slow Outlook Performance Caused by Large PST File Size\" \/>\n<meta property=\"og:description\" content=\"Fix slow Outlook performance caused by large PST files size. 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It splits all your data into smaller parts based on several criteria like Date, Folder, Size, and Sender.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.arysontechnologies.com\/blog\/fix-slow-outlook-performance-issues-caused-by-large-pst-file-size\/#faq-question-1747223876455","position":2,"url":"https:\/\/www.arysontechnologies.com\/blog\/fix-slow-outlook-performance-issues-caused-by-large-pst-file-size\/#faq-question-1747223876455","name":"Q2. Can I fix a large PST file without losing any data?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<strong>Ans:<\/strong> Yes, there are several ways to reduce the size of your PST file without losing any data. You can delete old emails, empty the Deleted Items folder, compact the file, or even split the large PST file.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.arysontechnologies.com\/blog\/fix-slow-outlook-performance-issues-caused-by-large-pst-file-size\/#faq-question-1747223904040","position":3,"url":"https:\/\/www.arysontechnologies.com\/blog\/fix-slow-outlook-performance-issues-caused-by-large-pst-file-size\/#faq-question-1747223904040","name":"Q3. Is it possible to split a large PST file by date or sender?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<strong>Ans:<\/strong> Yes, with specialized software, you can split a large PST file based on different criteria like date range or sender. This makes it easier to manage and find older emails.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.arysontechnologies.com\/blog\/fix-slow-outlook-performance-issues-caused-by-large-pst-file-size\/#faq-question-1747223926959","position":4,"url":"https:\/\/www.arysontechnologies.com\/blog\/fix-slow-outlook-performance-issues-caused-by-large-pst-file-size\/#faq-question-1747223926959","name":"Q4. Will splitting my PST file affect my email organization?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<strong>Ans: <\/strong>No, when you split a PST file using the recommended tool. 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