Fix For Constant Lag/Rubberbanding

That is an interesting find. There may be an issue with your installation for the Blizzard Desktop Application or something larger with the Desktop Application itself. It shoudn’t be causing the issue you experienced so I recommend doing a cleanout and replacement of the app, see if that allows you to have it running while playing:

1. Open file explorer/file manager (Right Click Windows Start)
2. Navigate to the folder where the desktop application would normally be installed. Delete that folder if it exists (usually program files x86)
3. Type the following into the address bar (not the search bar): %APPDATA% and press enter.
4. Delete the Bnet and blizzard folders inside the appdata folder if they exist.
5. Repeat steps 3 and 4 with %PROGRAMDATA% %LOCALAPPDATA% and %TEMP%
6. Empty the recycle bin.
7. Now reinstall the app to the C: Drive.

When you login you will be prompted to relocate your games, it will verify them and you should be all set.