How can I fix Outlook being slow due to a heavy PST file?

Outlook's performance lowers a lot when your PST file gets too big (10GB, 20GB, or more). It takes a long time to start up, search results are delayed, and it often freezes. This happens because Outlook has trouble indexing and loading huge PST files.

One effective solution to this issue is to divide the PST file into smaller, more manageable components. For this job, I suggest utilizing Softaken Split PST Software, which was made just for this. Here is why it’s worth trying:

• There are several ways to split PST files: by size, folder, year, or date range.
• Data integrity is kept up; there is no chance of losing emails, attachments, or the folder hierarchy.
• Wide Compatibility: Supports MS Outlook and Windows OS all editions
• Easy to Use: The interface is simple and doesn't require any technical knowledge.
• Works Without Outlook: You can split PST files even if you don't have Outlook on your computer.

After splitting, you can load smaller PST files back into Outlook, which will speed up performance, reduce lag, and minimize crash dangers.

Outlook often slows down when dealing with oversized PST files, leading to lag, crashes, or sync issues. The Shoviv PST Splitter Tool offers an effective solution by dividing large PST files into smaller, manageable parts without data loss. It supports splitting by size, date, folder, or email ID, giving users flexibility based on their needs. By reducing the file size, Outlook performance improves significantly—emails load faster, and navigation becomes smoother. The tool preserves the original folder structure and metadata, ensuring data integrity throughout the process. Compatible with all Outlook versions and Windows OS, Shoviv PST Splitter is ideal for maintaining optimal Outlook speed while preventing file corruption due to size overload.
Read more: Split PST File

If your Outlook is slowing down due to a heavy PST file filled with duplicate emails, contacts, or calendar entries, the SysTools Outlook Duplicate Remover is the perfect solution. This tool quickly scans your mailbox, identifies duplicates based on multiple criteria, and removes them in bulk — reducing PST size and improving Outlook’s speed instantly. You can check it out here: SysTools Outlook Duplicate Remover.