There was this strange bug on my PC recently, where opening a window in explorer would cause a very noticeable lag as the filenames disappeared one after the other, and then reappeared once the folder loaded. This behavior was not something I’d seen, but here is the solution.
Relevant thread: https://www.reddit.com/r/ZephyrusG15/comments/tejcny/file_explorer_lagging_name_disappear_one_at_a/
The program is called ShellExView, and can be used to disable “Adobe PDF Preview Handler” which takes care of the issue.