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Re: xsrc/56279: line editing performance regression in xterm(?)

The following reply was made to PR xsrc/56279; it has been noted by GNATS.

From: David Holland <>
Subject: Re: xsrc/56279: line editing performance regression in xterm(?)
Date: Sun, 4 Jul 2021 16:52:48 +0000

 On Sun, Jun 27, 2021 at 05:20:00PM +0000, wrote:
  > After updating to 9.99.85 line editing performance in xterm,
  > specifically of inserting characters at the beginning of a long line,
  > seems to have become awful.
  > If you paste a few lines' worth of junk, go to the beginning of the
  > input, and start typing, it's now easy to type faster than the display
  > updating can keep up with. At least in xterm. I first noticed this in
  > tcsh, but it also affects sh, though curiously it seems to _not_
  > affect gdb from base.
 Critical factor: it depends on how much the xterm has scrolled. A
 fresh one doesn't exhibit the problem, but scrolling a few pages of
 text makes the lag noticeable.
 Doesn't seem to be directly proportional to how much scroll there's
 been though; I did uuencode /netbsd /netbsd and let that scroll (which
 takes a while) and that makes it slower, but not markedly slower from
 one that's scrolled only 4-5 screeunfuls.
 David A. Holland

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