Public bug reported:

Binary package hint: vim

Rendering in gvim is very slow compared to previous Ubuntu releases.
It's usable, but takes patience. I'm using vim/gvim 7.1.314-3ubuntu3.1
on Ubuntu 8.10.

Others have reported this same issue on a thread from the vim mailing list. 
Many solutions have been tried w/o success:
http://groups.google.com/group/vim_use/browse_thread/thread/dd1d8d9a799adf4a

>From the thread, someone provided this benchmark script:
-- -- --
" Benchmark vim's redrawing speed
let i = 0
while i < 2000
  1
  redraw
  $
  redraw
  let i = i + 1
endwhile
qa!
-- -- --

I've run it with /etc/init.d/README as an input file (just to pick
something consistent across Ubuntu machines):

$ time vim -u NONE -U NONE  -S test-redraw-speed.vim /etc/init.d/README 
real    0m5.407s
user    0m0.568s
sys     0m0.048s

$ time gvim -u NONE -U NONE -f -S test-redraw-speed.vim /etc/init.d/README 
real    3m27.614s
user    0m11.685s
sys     0m0.312s

As you can see gvim is almost 40x slower then vim (running in gnome-
terminal). You'd expect gvim to be slower then vim, but not by this
much. Note, from the thread, not all users experience this huge
difference. Some only report 2-3x slowdown, which I'd be very happy with
at this point :)

I'm using the radeon X11 driver (open source) on a ThinkPad T42p, and do
_not_ experience slow rendering in other apps (for example, gedit).

** Affects: vim (Ubuntu)
     Importance: Undecided
         Status: New

-- 
gvim rendering is slow
https://bugs.launchpad.net/bugs/320700
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