Build Identifier: http://hg.mozilla.org/mozilla-central/rev/ab2ff3b5611f Mozilla/5.0 (Windows NT 6.1; WOW64; rv:14.0) Gecko/20120323 Firefox/14.0a1 ID:20120323031214 Page load is very slow on Google Presentation. WonderCsabo reported similar problem See http://forums.mozillazine.org/viewtopic.php?p=11850497#p11850497 Reproducible: Always Steps to reproduce: 1. Start Firefox and other application(such as Explorer) 2. Login Google 3. Open Google Docs Template Gallery https://docs.google.com/templates?type=presentations&pli=1# 4. Find "Beverage Package" and Click "Use This Template" 5. Wait completion of page loading Actual results: Page load is very slow on Google Presentation. It takes about 8 sec in Firefox5. It takes about 15 sec in Firefox and later. Expected results: Should not slow Regression window Cannot reproduce: http://hg.mozilla.org/mozilla-central/rev/0c3bd5909e79 Mozilla/5.0 (Windows NT 6.1; WOW64; rv:6.0a1) Gecko/20110420 Firefox/6.0a1 ID:20110420170520 Can reploduce: http://hg.mozilla.org/mozilla-central/rev/46fdf12082d4 Mozilla/5.0 (Windows NT 6.1; WOW64; rv:6.0a1) Gecko/20110421 Firefox/6.0a1 ID:20110421030547 Pushlog: http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=0c3bd5909e79&tochange=46fdf12082d4 Triggered by: fd8e217b2c84 Jonathan Kew — bug 642589 - expose prefs for tweaking DirectWrite/D2D antialiasing behavior. r=jdaggett Graphics Adapter Description: ATI Radeon HD 4300/4500 Series Vendor ID: 0x1002 Device ID: 0x954f Adapter RAM: 512 Adapter Drivers: aticfx64 aticfx64 aticfx32 aticfx32 atiumd64 atidxx64 atiumdag atidxx32 atiumdva atiumd6a atitmm64 Driver Version: 8.950.0.0 Driver Date: 2-14-2012 Direct2D Enabled: true DirectWrite Enabled: true (6.1.7601.17776) ClearType Parameters: Gamma: 2200 Pixel Structure: RGB ClearType Level: 50 Enhanced Contrast: 200 WebGL Renderer: Google Inc. -- ANGLE (ATI Radeon HD 4300/4500 Series) -- OpenGL ES 2.0 (ANGLE 1.0.0.963) GPU Accelerated Windows: 1/1 Direct3D 10 AzureBackend: direct2d

The problem does not happen if I disabled HWA.

I can confirm this bug. I could reproduce this on two computers, disabling HWA resolves the problem on both of them. I first ran into this when visiting this presentation page: https://docs.google.com/presentation/d/1QgY4op4wbrqIUsuiw6I4MVikTcrhMQ-YJvDYccxUzlE/edit#slide=id.p13 but i can reproduce it with this one, too: https://docs.google.com/presentation/d/1JIUdN1eb1r2ZHK2Gb7DvqS-3mpV6QvM5GegZivVcmyY/edit#slide=id.g96f2286_0_27

The issue is no longer present in Nightly 16.0, cs: 6338a8988917. I tested with both of presentations provided in my previous post. The loading takes about 8 seconds, but Chrome 21 uses this amount of time, too. I'm on Windows 7 x64, everything is on default, HWA is on.

Fixed range(m-c) Bad: http://hg.mozilla.org/mozilla-central/rev/36e938e51481 Mozilla/5.0 (Windows NT 6.1; WOW64; rv:15.0) Gecko/15.0 Firefox/15.0a1 ID:20120522212625 Fixed: http://hg.mozilla.org/mozilla-central/rev/aa2b52bd0374 Mozilla/5.0 (Windows NT 6.1; WOW64; rv:15.0) Gecko/15.0 Firefox/15.0a1 ID:20120523024422 Pushlog: http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=36e938e51481&tochange=aa2b52bd0374 Fixed range(m-i) Bad: http://hg.mozilla.org/integration/mozilla-inbound/rev/bbb12d0bcf49 Mozilla/5.0 (Windows NT 6.1; WOW64; rv:15.0) Gecko/15.0 Firefox/15.0a1 ID:20120521220651 Fixed: http://hg.mozilla.org/integration/mozilla-inbound/rev/abbf642df562 Mozilla/5.0 (Windows NT 6.1; WOW64; rv:15.0) Gecko/15.0 Firefox/15.0a1 ID:20120521222950 Pushlog: http://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=bbb12d0bcf49&tochange=abbf642df562 I guess this is fixed by abbf642df562 Bas Schouten — Bug 715768: Enable Azure-Thebes wrapper by default for D2D. r=jrmuizel

Calling this fixed by bug 715768 based on comment 4.