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+--- Thread: Outlook Running Very Slow – Could Compressing PST Files Fix It? (/thread-21040.html)
Outlook Running Very Slow – Could Compressing PST Files Fix It? - Brantanson01 - 10-21-2025
Lately, my Microsoft Outlook has been running extremely slow, especially when opening emails or switching folders. I suspect the issue might be due to a large PST file size since it has been growing for years without cleanup. Can anyone confirm if compressing the PST file can help improve Outlook’s performance? If yes, what is the correct way to safely compress a PST file without losing any data? Also, are there any tools or settings within Outlook that make this process easier?
RE: Outlook Running Very Slow – Could Compressing PST Files Fix It? - rebeccareed - 10-21-2025
If your Outlook PST file has become too large, this could be the reason. Large PST files slow down Outlook and cause frequent hangs. I found a solution to this problem with Softaken Compress PST Software. This tool easily compresses large PST files without any data loss. This improves Outlook performance and speeds up email loading. This software supports all versions of Outlook (2021, 2019, 2016, etc.) and reduces the size by extracting attachments. If your Outlook is also running slow, definitely try Compress PST Tool, a safe, fast, and reliable solution!