Sorry if you are still experiencing load times. It might be worth it to build a cache layer for the API so that the responses are quicker. Will look into how to improve that :/

It should already support both mouse and keyboard options for reviewing flashcards. Is one of those methods not working for you?

The Airtable sheet is pretty simple. It is simply a Card table with Front, Back, and Deck columns and the Deck table contains all the other information you might see on the site. I also have a table for reporting issues through that report form you included.

That's really cool. I hadn't seen that before. I've bookmarked it for future ideas :D