The 2 most recent Anki updates for Windows 10 I have had the same issue. The app works fine when I first open it but after 20 minutes or so each card gets progressively slower to lag, pictures get slower and slower to load, and even editing cards there is a HUGE lag between key strokes/clicks and the command processing. If I close out of Anki, it works fine when I reopen it again but like clockwork the problem begins again ~20 minutes into studying. I have tried suspending all add-ons and it still happens. I tried uninstalling and reinstalling the Amboss add-on, and it still happens. Any other advice?