I had the issue that changing the deck of a card takes exceedingly long (freezes). Already calling the change-deck-function with a right-click takes long, and then actually changing the deck as well.
In such a situation, the task manager reports that one of the two python processes is not responding. After a minute or so, work resumes.
Also Anki starts up quite slowly..
After disabling the addon, the issue seems to have gone away (for now, I will notify you here if it reappears without the addon).
Version info:
25.09.2 (3890e12c)
Python 3.13.5 Qt 6.9.1 Chromium 122
Windows 11 25H2