[Bug 320700] Re: gvim rendering is slow

[Eric Jiang]

I am running VIM 7.4 on Ubuntu 14.04.4 and noticed that this problem
only appeared *after* I switched to an AMD Radeon 7770 graphics card.
Previously, with my Nvidia graphics card this problem did not exist.

I am running the fglrx-updates proprietary driver provided by the built-
in "Additional drivers" tool (2:15.201-0ubuntu0.14.04.1).

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https://bugs.launchpad.net/bugs/320700

Title:
  gvim rendering is slow

Status in vim package in Ubuntu:
  Confirmed

Bug description:
  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).

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