Spaced repetition is still good for knowledge you need to retrieve immediately, when a 2-second delay would make it useless.
Not sure about other people/​situations, BUT I personally have found, in classroom settings relating to math and CS theory, that a 2-second delay can impede understanding. Especially when a definition relies on a combination of well-chunked previous concepts, which is especially the case when dealing with math.
Not sure about other people/​situations, BUT I personally have found, in classroom settings relating to math and CS theory, that a 2-second delay can impede understanding. Especially when a definition relies on a combination of well-chunked previous concepts, which is especially the case when dealing with math.