Re: debug performance problem

[Richard Stallman]

    Maybe doing the work from a jit-lock hook could get us there.

I did something effectively more or less like that, but simpler.
Maybe it is fast enough now.

If not,

    Or maybe we should only highlight the function names at the left
    margin rather than inside expressions.  This could be supplemented
    with a mouse-2 binding that works even if the symbol is not highlighted
    (by checking symbol-at-point).

those seem like good ideas.

    Incidentally, I think that help-mode suffers from the same problem:
    C-h v load-history takes an unacceptable time to come up.  I plead
    guilty of writing the code that does the highlighting of the symbols
    inside the variable's value, and I think it should be removed or
    conditionalized on the value's size.

Would you like to do it?