[cairo] Performance regression on Windows

[Nicolas Dufour]

Hi Chris, hi all,


Le Lundi 18 novembre 2013 17h09, Chris Wilson <chris at chris-wilson.co.uk> a écrit :
On Sat, Nov 16, 2013 at 08:15:57AM +0000, Nicolas Dufour wrote:
>> Could you tell me if the performance issue we experience is a known bug?
>
>It's not known, but it was an obvious risk with refactoring the code. It
>probably needs more refinement on surface migration.

Recent investigations show that the slowness affects the following graphic cards:
* Intel HD Graphics 2500 (Dell Optiplex 3010);
* Intel GMA 4500 (Dell Optiplex 780);
* Intel 82945G Express.
But NOT the following ones:
* ATI Mobility Radeon HD 4500 Series;
* NVidia Quadro 1000M;
* NVidia GeForce GTX 660 Ti;
* Intel HD 3000 (integrated).

That tends to confirm the bug affects some Intel cards (but not all), and none of the cards from ATI and NVidia we tested.
Related Free Desktop bug report: https://bugs.freedesktop.org/show_bug.cgi?id=71833
Related Inkscape thread: http://inkscape.13.x6.nabble.com/Devlibs-46-too-slow-tt4966631.html#none

Don't hesitate to ask if you want me to test a patch or anything else that could help solving the issue.

Regards,
--
Nicolas