They do that, yet proceed to kneecap the perceived latency by delaying the render.
reply> And on keyUp (the user releases the key), we render the suggestions.
There are a large number of edge cases where rendering it on key down would not be desirable (user types Ctrl+v, how accented characters are enetered, how some Asian languages get handled, backspace/delete, user holds a key down, etc). This is getting into the point of optimization where it simply does not matter and can actually harm things
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