Re: Low redisplay performance (23 regression)

[Dan Nicolaescu]

David Reitter <address@hidden> writes:

  > I've been noticing a substantial slowdown in redisplay performance.
  > Scrolling down emacs.c in fundamental-mode takes about 2 seconds in
  > Emacs 22 (Carbon port), and 3 seconds in Emacs 23 (NS port).
  > 
  > With font-lock-mode (in c-mode) enabled, the difference is even larger:
  > 
  > About 2.5 seconds in Emacs 22, and more than 7 seconds in 23/NS.
  > 
  > The effect interacts with the display of overlays etc. in the header
  > line.  When turning that off, I get about 2.5 seconds in Emacs 22, and
  > still more than 4 seconds in 23/NS.  (All values estimated manually
  > from several tries.)
  > 
  > I'm wondering if others get the same on other platforms comparing 22
  > and 23, or if this is a problem specifically in the NS port (for
  > example, with setting drawing color or the like).

I have not measured anything, but I do not see any visible difference on
GNU/Linux.