A useful stat I remember from another SRS (probably Anki) was the time of day when you perform best e.g. some people get more cards correct first thing in the morning. It’s not mission critical, but useful information
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This seems like an interesting feature! I’ve tried just moving my times around and making a note of my efficiency. I haven’t seen anything huge, it’s more depended for me on how much sleep I’ve had for the day.