Bridge cache performance has always been a little problematic, and with the latest version (12.0.0.234) on Windows 10 I'm seeing a little slowness that was not there in previous versions.
When I bounce around between "old" folders that have been previously cached, it takes 10 to 15 seconds for Bridge to finish the thumbnail display and allow smooth scrolling for image selection. The little spinning wheel in the bottom left status bar shows this. This is on folders with 100 to 150 images, a mix of tif, jpeg and raw. The more images, the longer the delay of course.
If I bounce back and forth between just 2 folders, the delay is only on the initial visit. After that, response is almost instant, maybe 1 to 2 seconds. But if I visit more folders, and then come back to the 1st folder, the 10-15 second delay returns.
This seems to indicate there is a cache somewhere that is fairly small. My main Bridge cache is huge, 150 GB. My Camera Raw cache is 30 GB. I'm not aware of any other cache. Is there one?