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

[Allin Cottrell <cottrell wfu edu>]

On Thu, 20 Oct 2011, Clemens Eisserer wrote:

> Hi Allin,
>
> > (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.
>
> Thanks for testing :)
>
> I am on Fedora-16 with gtk-3.2.0-1 using the gtk3's default theme I
> can easily produce several seconds of "after-scrolling",
> however I have a large monitor (1920x1200). gtk2 is gtk2-2.24.6 with
> "Mist" theme.
> Both results are not good, even with gtk2 I can't just grab the slider
> and scroll without stuttering (which works with Java and QT),
> however with gtk3 its a lot slower. How much is hard to quantify
> without frameworks available to measure.
>
> Your CPU is about ~50% faster than mine - probably that's just enough
> to not let scroll-events queue up?

Possibly. Since you mention themes, I should say that with 
both gtk2 and gtk3 I'm using "no theme", just the plain 
vanilla out-of-the-box gtk appearance (which looks much better 
in gtk2). I don't know how relevant this is to scrolling 
speed.

Allin