x-select-utf8-or-ctext is too slow

[Jesper Harder]

Yanking text from another application to Emacs is extremely slow.  It
took 40 seconds for me to yank just 1000 lines of text from Mozilla to
Emacs -- all of it spent in `x-select-utf8-or-ctext'

I think it's rather bad for the user experience for such a commonplace
operation to be so sluggish.  This was not the case in Emacs 21.3.


In GNU Emacs 21.3.50.46 (i686-pc-linux-gnu, GTK+ Version 2.0.2)
 of 2004-02-09 on defun.localdomain
configured using `configure '--with-gtk''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US.iso88591
  locale-coding-system: iso-latin-1
  default-enable-multibyte-characters: t