--- On Sat, 7/23/11, Jakub Misak <jmisak@xxxxxxxxxx> wrote: > From: Jakub Misak <jmisak@xxxxxxxxxx> > Subject: Is GTK+ 3.x 2x slower than GTK+ 2.x? > To: gtk-list@xxxxxxxxx > Date: Saturday, July 23, 2011, 12:30 PM > > Is GTK+ 3.x 2x slower than GTK+ 2.x? > > Hello, > > When I upgraded to GTK+ 3.0, the first thing that struck me > was how > sluggish it was compared to 2.24. The same dialogs in the > same > application appear immediately on the screen in the 2x > version, while > it takes time to paint them on the screen with the 3.x > version. > Browsing through menus or switching between tabs consumed > 2x or 3x more > CPU cycles in the 3.x version. The file open/save dialog is > much slower > (slower to show up, slower to change directories). Or > hovering over the > toolbuttons in 3.x-based Glade consumed 80% CPU cycles and > the > highlighting could barely keep up with the mouse cursor. > Application > startup is a bit slower with 3.x, too. > > So I made a (very) simple and stupid benchmark that tests a > couple of > basic things in a loop, to see how the two GTK+ versions > compare. > If you're interested, you can download it here: > > http://www.fileupyours.com/files/310686/perftest.tar.gz > > (A simple "make" command should build both versions.) > > I am testing it in xfwm4 with compositor turned off. If you > test it in > a compositing WM with window effects (open/close), > especially with > test #3 which opens/closes a dialog 50 times, it may > measure something > else than GTK+ speed... > > The default GTK+ theme (Raleigh) was used for both 2.24 and > 3.0.11. > Both GTK+ 2.x and 3.x software was already running, so both > library > versions were loaded in memory (so it was probably not an > issue for the > startup speed). > > The results from my 3GHz dual CPU desktop machine with the > open-source > radeon driver (I ran each test 7 times and took the best > result for each > test): > > Startup, GTK+ 2: 0.11081 s, GTK+ 3: 0.14468 s > Test 1, GTK+ 2: 4.34362 s, GTK+ 3: 8.83771 s > Test 2, GTK+ 2: 1.72010 s, GTK+ 3: 2.33266 s > Test 3, GTK+ 2: 2.27047 s, GTK+ 3: 4.79270 s > > It's not just my computer, as I tried it on an HP 625 > laptop, again > using the radeon driver: > > Startup, GTK+ 2: 0.09357 s, GTK+ 3: 0.13600 s > Test 1, GTK+ 2: 3.27795 s, GTK+ 3: 5.20183 s > Test 2, GTK+ 2: 1.47700 s, GTK+ 3: 1.46733 s > Test 3, GTK+ 2: 1.35302 s, GTK+ 3: 5.14810 s > > It's not the radeon driver either, as I tried it with the > proprietary > fglrx driver, too: > > Startup, GTK+ 2: 0.09058 s, GTK+ 3: 0.13770 s > Test 1, GTK+ 2: 2.42151 s, GTK+ 3: 6.67091 s > Test 2, GTK+ 2: 1.15294 s, GTK+ 3: 1.44557 s > Test 3, GTK+ 2: 1.31779 s, GTK+ 3: 4.64865 s > > It's probably not the default theme either. First, the > default themes > look very similar in both versions. Second, test 2 does not > seem to be > influenced by the GTK+ version too much. Third, when I use > slow fancy > themes in both GTK+ versions (Victory, Adwaita, New > Wave...), I still > get the same pattern again - even though a fancy theme > makes both > versions (sometimes even 6x) slower, 3.x is still 50-150% > slower than > 2.x (except for test 2, which seems to be mainly influenced > by the > theme itself). And fourth, even a slow fancy GTK+ 2.x theme > is faster > than the plain default 3.x theme. > > Finally, it's not my Linux distribution either. I ran the > tests in 3 > different distros (Arch Linux, LMDE and Fedora 15, with > Xfce in all of > them), and always got similar results. > > So my question is - is there something in GTK+ 3.0 that > could possibly > cause such a dramatic slowdown compared to 2.24? > _______________________________________________ > gtk-list mailing list > gtk-list@xxxxxxxxx > http://mail.gnome.org/mailman/listinfo/gtk-list > File a bug. Regards, Sergei. _______________________________________________ gtk-list mailing list gtk-list@xxxxxxxxx http://mail.gnome.org/mailman/listinfo/gtk-list
