Have Premiere store thumbnails for video clips in the project panel.
Every time a project is closed and opened again, the video clip thumbnails in the project panel (if you're using thumbnail view) have to be rebuilt. It would be great if Premiere could store these thumbnails in the same way it does PEK files for audio clips, so that they wouldn't have to be rebuilt every time you open a project. As it is now, if you have a large number of video clips in a folder in the project panel, you have to scroll down to reveal them in order for their thumbnails to build. The best solution would be to make this optional, in the same way you can choose to disable "Automatic audio waveform generation" in the preferences. That way, if there are users who never use video thumbnails, they wouldn't have to take the time to initially build the thumbnails.
Andy Adkins commented
The requests to improve thumbnail generation/loading (an absolute productivity-killer which Adobe should be embarrassed about) are scattered all over the place so let's try to clean this up a bit. The one with the most votes appears to be here, so please vote and comment if you haven't:
Maybe this will make them hears us better. Maybe. I personally don't care how they fix it - either through a cache, loading in the background or by just making them 10x faster to load. I have a fast modern machine and fasts storage and it's still awful. Pulling stuff off older/slower archive drives is just painful. Seems to be worse w/ h264 gop media and faster w/ prores. 422 10 bit long-gop footage from a GH5 has been about the slowest.
Eliot Scarpetti commented
This probably costs me 20 minutes a day (assume 8 hour work day). Waiting for thumbnails to load.