I just failed on speed review I feel like most of my time was spent reading. Then I realized I have the same time to review full sentences as I do one word entries. This needs to be adjusted by word count. So you get more time to read 30 words on the screen vs reading 5 (where one is a single word with all single word choices vs the other being a sentence/phase and the rest being equal in size).
It would be even cooler to have some form of dynamic learning where memrise could pick up a bell curve on how long it takes a normal person to get an answer and calibrate it that way…