IIRC, the problem probably is that with command remapping,
where-is-internal in 22.x has to lookup the key binding for each
command to see if it remapped -- in the normal case (where a command
only has a few bindings), the penalty is neglible, but for
self-insert-command specifically, that will be time consuming.
Could you show me where the code is that does this?
Maybe I can speed it up with some sort of memoization.
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