I created an upstream bug, see
https://bugzilla.gnome.org/show_bug.cgi?id=781153

Let's hope we get some feedback...


Am 10.04.2017 um 20:01 schrieb Eduard Braun:
Am 10.04.2017 um 10:37 schrieb Eduard Braun:
Am 10.04.2017 um 07:56 schrieb Yale Zhang:
I've noticed dragging objects has become very slow (the refresh rate
is very low) in trunk.

I did a binary search and found the culprit is revision 15531 (Disable
GTK3 "client side decorations" on Windows by setting "GTK_CSD=0").

Eduard, are you seeing this? Do you think it's fundamentally caused by
disabling CSD or incidentally by some bug in GTK+?

-Yale
Hi Yale,

yes, I noticed slow dragging in trunk, but didn't make the connection to 
"GTK_CSD=0" (thought it was a general gtk3 issue).

I hope it's not a fundamental issue, as it would mean we'd be unable to 
achieve an even remotely native look on Windows (that's the very reason 
why I set that option in the first place).

I'll check this evening if re-enabling client side decorations also 
resolves the other performance issues I'm seeing in trunk compared to 
0.92.x and in any case I hope there's a possibility to get this fixed 
upstream.

Regards,
Eduard

Just did a quick check:

Yale: Are you (or anybody else) able to compile a working version of the stable branch with "WITH_GTK3_EXPERIMENTAL" enabled? I wanted to check if the remaining performance regressions might be related to the changes implemented during the last hackfest (which got reverted in 0.92.x in r15024), but my gtk3 build does not show the canvas at all (making a bit hard to compare drawing performance ;-) ).

Regards,
Eduard



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