Here's what I've observed from some crazy experiments.  I've noticed
that Evolution 2.22, regardless when using it on a normal Ubuntu install
or on a LTSP thin client, it is more sluggish than the Evolution 2.12
found in Gusty, for the very same reasons stated above.  It seems to
take two seconds for Evolution to "Formating Message" where the previous
version, the formating was instant.  Scrolling from one email to the
next is also very choppy, especially using the previous and next buttons
in the tool bar.  This is experienced on a variety of machines, all at
different speeds and specs (and apparently many other users).

To try and pin-point what the problem is, I tried a few combinations of
installs and found mixed results.  All of these tests were with thin
clients.  First I had a basic Ubuntu 8.04 and LTSP installed and the
8.04 Evolution packages installed by default which had poor performance.
I then installed Gusty's Evolution packages 2.12 instead of Evolution
2.22 on the very same server and the performance was excellent.  I then
tried Debian Lenny's Evolution packages 2.22 on this server and found
the problem still exists.  I then tried a complete install of Debian
Lenny's LTSP server and Evolution 2.22 and found the performance to be
excellent (overall much quicker than Ubuntu's I might add).  In summary:

8.04 LTSP + 8.04 Evo 2.22  = slow performance
8.04 LTSP + 7.10 Evo 2.12  = excellent performance
8.04 LTSP + Debian Evo 2.22 = slow performance
Debian Lenny LTSP + Debian Evo 2.22 = excellent performance

Based on these results, there is something about the Evolution 2.22
Ubuntu package that makes it a great deal sluggish than 2.12 in Gusty
(the problem does NOT exist in Debian).  When installing the 2.12
packages, I found no problem whatsoever so the problem seems to be with
Evolution 2.22 and that the LTSP thin client model magnifies the problem
a great deal.

I hope this helps somewhat on where to look.

-- 
[8.04] Drawing evolution window on screen very slow
https://bugs.launchpad.net/bugs/225950
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