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Document Editing Problems

How to Fix Slow Performance and File Merging Issues in WPS Office

Bushra ParveenBushra Parveen Oct 19, 2026 869 views

Question details

The user is experiencing application sluggishness and failure errors when attempting to merge multiple document files.

How to Fix Slow Performance and File Merging Issues in WPS Office
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.
Before you start

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.

Solution 1Recommended

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.

1
Update the Application

Open the application settings or visit your device's app store to check for and install the latest software updates.

2
Restart Your Device

Completely power off and restart your computer or mobile device to clear system memory and halt conflicting background processes.

3
Clear Temporary Files

Navigate to the application's internal settings or your system's app management menu, and select 'Clear Cache' to remove temporary processing data.

4
Retry the Merge Process

Reopen the application and attempt to merge your files again to see if the performance has improved.

Clear Application Cache and Update the Software
Cache Cleared: Clearing the cache will not delete your saved documents or personal files; it only resets temporary system data.
Seamless Document Management

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. 1. Open WPS Office: Launch the WPS Office desktop application and click on the 'Tools' tab from the home dashboard.
  2. 2. Select the Merge Tool: Click on 'Merge Documents' or 'PDF Merge' depending on the specific file types you want to combine.
  3. 3. Add Your Files: Click 'Add Files' to select the documents from your local storage and load them into the merging queue.
  4. 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.
Merge large files quickly without application lag or system freezing.Fully compatible with Microsoft Office formats including DOCX, XLSX, and PPTX.Intuitive interface for reordering and combining documents in just a few clicks.Lightweight installation ensures minimal memory usage during heavy processing tasks.
microsoft office alternative - wps office

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.