The EXA fix was included in 1.5.3:
http://lists.freedesktop.org/archives/xorg/2008-November/039956.html

** Description changed:

  I noticed bad performance regression with xorg-server 1.5.2 (intrepid) 
against 1.4 (hardy). For the detailed report see here:
  http://lists.freedesktop.org/archives/xorg/2008-October/039277.html
  
  There are two known problems:
  
  1) Patch to fix slow EXA in 1.5.2:
  http://lists.freedesktop.org/archives/xorg/2008-October/039405.html
+ the fix was included in 1.5.3:
+ http://lists.freedesktop.org/archives/xorg/2008-November/039956.html
+ 
http://gitweb.freedesktop.org/?p=xorg/xserver.git;a=commitdiff;h=f4c33e2e64ce83c29c3bc79853e421247acfea11
+ 
  
  2) Reading the suggestions from the thread at
  http://lists.freedesktop.org/archives/xorg/2008-October/039277.html
  this backported patch from 1.6 should fix the performance regression in 1.5:
  
http://cgit.freedesktop.org/xorg/xserver/commit/?h=server-1.5-branch&id=8ef37c194fa08d3911095299413a42a01162b078
- 
- The fix was applied to the 1.5 branch but was later reverted. It appears that 
this fix breaks  the ABI (so it's not for intrepid):
+ This fix was applied to the 1.5 branch but was later reverted. It appears 
that this fix breaks  the ABI (so it's not for intrepid):
  https://bugs.freedesktop.org/show_bug.cgi?id=16647#c23

-- 
[intrepid] 1.4 -> 1.5.2 bad performance regression
https://bugs.launchpad.net/bugs/280671
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