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From: David Ponce <david@dponce.com>
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Subject: Re: byte-compiler very slow
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Hi Richard,

 > Thanks for tracking down the slowness in byte-compile-cl-warn.  With
 > that information it was not hard for me to speed up the test.
 > Please try this.

Your patch works like a charm!  Here is the new profiling result I got
when byte-compiling edebug.el:

emacs-lisp-byte-compile  1           3.024         3.024
byte-compile-cl-warn     3590        0.581         0.0001618384

Compared to result with previous version:

emacs-lisp-byte-compile  1           11.978        11.978
byte-compile-cl-warn     3590        9.1439999999  0.0025470752

Did you receive my patch to improve the performance of
`byte-compile-set-symbol-position'?

Thanks!
David