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From: Richard Stallman <rms@gnu.org>
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Subject: Re: Emacs 21/X11 generating unbelieveable network traffic
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    Have you tried the advice in PROBLEMS?
    In my experience, configure --without-xim makes a significant difference!

Is there anyone who can provide code to enable and disable xim at run
time, so that people can obtain this speedup when they want it without
having to forfeit the feature completely or recompile Emacs to use it
again?

Is there a way for Emacs to tell whether the user is using xim
so as to optimize performance when the user is not?