Performance change from X in Fedora Core 4 to Fedora Core 5

Daniel Stone daniel at
Sun Jul 9 12:00:43 PDT 2006

On Sun, Jul 09, 2006 at 11:55:36AM -0700, Keith Packard wrote:
> On Sun, 2006-07-09 at 16:27 +0100, Ross Burton wrote:
> > I should point out that at GUADEC we have people with benchmarks proving
> > that GTK+ 2.8 is slower than 2.6, the GTK+ developers, and the Cairo
> > developers in the same room.  At the moment profiling is being done,
> > Cairo is being optimised, and any non-essential and proven slow use of
> > Cairo in GTK is being removed.
> While cairo is certainly in need of performance improvements, the usage
> of cairo by Gtk+ 2.8 is very limited, to the point where cairo
> performance should have very little impact on Gtk+ application
> performance.
> As far as I understand it, the only Gtk+ widget using cairo is the color
> selector, and the only other significant usage is pango, which hits
> essentially the same Render paths through cairo as it did through Xft.
> We need to profile Gtk+ 2.6 and Gtk+ 2.8 environments before attempting
> to diagnose performance problems; uninformed speculation is not helpful.

The Maemo guys really did profile 2.6 vs 2.8, and it really was vastly
slower.  Carl has all the results in hand.

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