Re: JIT stealth font-lock tuning parameters

[Richard Stallman]

    I'm afraid I can't.  I don't see those pauses except for the
    ones that are reduced by syntax-ppss (which I have indeed tested and
    confirmed that it tends to reduce their frequency).

Why don't you see them?  Is it that you have a very fast machine?
What is different for you, such that you don't see the pauses?  Did
the use of syntax-ppss make it so fast that you no longer see a pause?

    Another line of attack is a local hack (that I haven't cleaned up
    yet) which adds a variable `quit-on-input' which forces any input
    to cause a quit.

That is a bizarre thing to do.  If this turns out to be enough of a
problem that we should try to solve it, I'd rather add a feature to
parse-partial-sexp to make it check for input every so often.