Re: Severe treeview performance regression (Gtk2 -> gtk3)

[Alexander Larsson <alexl redhat com>]

On Thu, 2011-10-20 at 18:15 +0200, Kristian Rietveld wrote:
> On Oct 20, 2011, at 12:03 PM, Clemens Eisserer wrote:
> > I hacked together a simple sample application which compiles under
> > gtk2 as well as gtk3: http://93.83.133.214/gtklist.c
> > Just maximize it (preferable on a large screen) and scroll with your
> > wheel - the gtk3 version should feel a lot slower.
> 
> I have noticed that as well on GTK+ 3 a year ago or so, and I don't
> think this is specific to GtkTreeView.  Back then I got the impression
> that some parts of the drawing "synchronization" (i.e. draw the moved
> area and the newly exposed area at the same time instead of first
> drawing the moved area and drawing the newly exposed area later) did
> not make it into the client-side-windows code.  However, I was told
> that such problem should not exist with client side windows (I was not
> convinced though).

The csw code takes a lot of care to try to ensure this. However, the csw
code exists on Gtk+ 2.x too, so its easy to verify by comparing Gtk3 and
a csw version of Gtk2.