How to Fix Slow Performance and File Merging Issues in WPS Office
Question details
The user is experiencing application sluggishness and failure errors when attempting to merge multiple document files.

- Product
- WPS Office
- Device & OS
- not provided
- Scenario
- Attempting to merge multiple documents or PDFs into a single file while the application is lagging or unresponsive.
- Observed behavior
- The application runs very slowly, freezes, or fails to complete the file merging process, preventing the creation of the combined document.
Check your internet connection if you are using cloud-based merging tools, and verify that the files you intend to merge are not password-protected or currently opened in another background program.
Clear Application Cache and Update the Software
Resolves most performance issues and glitches by removing corrupted temporary files and ensuring you have the latest performance patches.
Software updates often contain essential bug fixes for performance issues. Accumulated temporary data can also bog down the application's processing speed, especially during memory-intensive tasks like merging files.
Open the application settings or visit your device's app store to check for and install the latest software updates.
Completely power off and restart your computer or mobile device to clear system memory and halt conflicting background processes.
Navigate to the application's internal settings or your system's app management menu, and select 'Clear Cache' to remove temporary processing data.
Reopen the application and attempt to merge your files again to see if the performance has improved.

Verify File Compatibility and Integrity
Ensures that the files being merged are supported formats and not damaged, which frequently causes merging failures.
Contact Customer Support for Advanced Troubleshooting
If local troubleshooting fails, the support team can investigate account-specific or complex application errors.
Easily Merge Documents with WPS Office
WPS Office provides a fast, built-in document merging tool that handles various file formats without lagging. Enjoy smooth performance when combining multiple PDFs, Word documents, or spreadsheets in a lightweight environment.
- 1. Open WPS Office: Launch the WPS Office desktop application and click on the 'Tools' tab from the home dashboard.
- 2. Select the Merge Tool: Click on 'Merge Documents' or 'PDF Merge' depending on the specific file types you want to combine.
- 3. Add Your Files: Click 'Add Files' to select the documents from your local storage and load them into the merging queue.
- 4. Merge and Save: Drag and drop to adjust the final order of your files, then click 'Merge' to instantly combine them into a single, seamless document.

Frequently Asked Questions
Why does the application freeze specifically during file merging?
Merging large or complex files requires significant system memory. If your device has low available RAM, or if the application has corrupted temporary files, it may slow down or freeze. Clearing the application cache and closing background programs often resolves this.
What file formats are supported for merging?
Most modern document editors support merging standard formats like DOC, DOCX, and PDF. Attempting to merge unsupported, heavily encrypted, or heavily macro-enabled files may cause the merge process to stall or fail.
Will clearing the application cache delete my saved documents?
No, clearing the application cache only removes temporary background data used to speed up software loading times. Your saved documents, merged files, and personal settings will remain completely intact.




