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

[Allin Cottrell <cottrell wfu edu>]

On Thu, 20 Oct 2011, Clemens Eisserer wrote:

> > 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.
>
> I wonder why the gtk3 version of the treeview is so much slower....
> Scrolling such a basic widget on todays desktop processors shouldn't
> cause any troubles (I also developed a Swing JTable and a QT version,
> both scroll without any problems).
>
> Profiling with sysprof didn't reveal a single hotspot, its quite a
> flat profile with many lukewarm places.
> It seems, however, painting is not the problem (both cairo and X11
> stuff doesn't show anywhere near top)
>
> Would be great if someone more experienced could have a look at the demo,
> probably there are some lower-level issues that cause performance
> regressions elsewhere too.

I compiled your gtklist.c using

(a) gtk-2.24.7 and friends (latest stable stack)
(b) gtk-3.2.1  and friends (again, all latest stable)

I can't detect any difference in the scrolling performance in 
the two cases; it seems quite acceptable in both. This is on 
Linux 3.0.7, glibc 2.14, gcc 4.6.1, Core i5 2520M 2.50GHz,
Lenovo Thinkpad with "wheel-type" scrolling via Trackpad.

Allin Cottrell