899783 - D2D initialization delays first paint by hundreds of milliseconds

Status: NEW

(Core :: Graphics: Layers, defect)

Description

[Vladan Djeric (:vladan)]

I was measuring startup times for bug 890336, and I noticed that D2D initialization prolongs Nightly 25 startup time by almost 500ms. Cold startups are delayed by almost a full second. In particular, the time from creating the top level window to first paint is most affected.

Startup times with D2D disabled (driver blacklisted): 
https://docs.google.com/spreadsheet/ccc?key=0Aq4ElA0owpEbdHE0S1BiUlBTVWZqeTYtajFfanJzX0E&usp=sharing

Startup times with D2D force-enabled:
https://docs.google.com/spreadsheet/ccc?key=0Aq4ElA0owpEbdG9sdVY5WXZVV3dHbm9jUU5aVktlTXc&usp=sharing

Note: The "stock" build in the above documents is Nightly 25 from July 9th. The "patched" build is a modified version from bug 890336 and is not relevant to this bug.

The test machine is Jeff Muizelaar's "aquaman" laptop: AMD C-50 processor dual-core @ 1GHz, 2GB RAM shared with Radeon HD 6250M video card, 64-bit Windows 7.

Comment 1

[Milan Sreckovic [:milan] (needinfo for best results)]

Have these numbers changed recently at all?  Did D2D1.1 make a difference?

Comment 2

[Markus Stange [:mstange]]

Here's a profile collected from a Windows 7 Tryserver Talos ts_paint run:
http://tests.themasta.com/cleopatra/?report=8b9530a5fb2506a691913979423a297da3a9ee07
https://dl.dropboxusercontent.com/u/2901861/Screenshots/Bildschirmfoto%202013-08-12%20um%2011.23.25.png