Are you using OC 3.106 or older?
How easy can you reproduce this issue? I don't have Solidworks, but if you can easily reproduce it, can you please try this version:
1. Extract into a new folder,
2. Close OC completely
3. Copy these 3 files and paste into OC install folder (it will ask for admin permissions to replace those files)
4. Run OC (if connector is disabled, start it from new location manually)
Please try to reproduce the issue in Solidworks
If it still happens, open any Open/Save dialog to see the Connector and you will see new Settings button in it, click to Enable Polling.
Close connector (x), start again, and see if you can reproduce the slowdown