Will have a check. I got a decent PC nowadays compare to few months back so I can be free of worries (for now).
Anyway, I decide to download the bunny test video. Here is a demo;
Non-hover
Hover
Ah I thought it would be a plugins that causing an issue, please ignore me if you don’t plan to or want to support it. Stash don’t have any 'hover preview support’, it was done through a plugins;
Here how it look without the plugins:
The plugins I use that show me preview and it change the size;