User Agent: Mozilla/5.0 (Windows NT 6.2; WOW64; rv:33.0) Gecko/20100101 Firefox/33.0 Build ID: 20141011015303 Steps to reproduce: 1. Go to http://soulwire.github.io/sketch.js/examples/particles.html 2. Move your mouse and notice it is running very slow 3. Start Firefox in safe mode and repeat 4. Notice it is now fluid Actual results: There is a difference of performance between normal mode and safe mode, which shouldn't happen. This has also been tested on a new (blank) profile and on a different computer. Chrome behaves properly. Expected results: No difference (or at least a smaller one) between normal mode and safe mode.
Could you paste "Graphic" section of about:support ?
Hi, here you go: Graphics Adapter Description NVIDIA GeForce 210 Adapter Drivers nvd3dumx,nvwgf2umx,nvwgf2umx nvd3dum,nvwgf2um,nvwgf2um Adapter RAM 1024 ClearType Parameters D [ Gamma: 2200 Pixel Structure: R ClearType Level: 100 Enhanced Contrast: 50 ] D [ Gamma: 2200 Pixel Structure: R ClearType Level: 100 Enhanced Contrast: 50 ] Device ID 0x0a65 Direct2D Enabled true DirectWrite Enabled true (6.2.9200.16581) Driver Date 7-2-2014 Driver Version 126.96.36.19952 GPU #2 Active false GPU Accelerated Windows 1/1 Direct3D 11 (OMTC) Vendor ID 0x10de WebGL Renderer Google Inc. -- ANGLE (NVIDIA GeForce 210 Direct3D9Ex vs_3_0 ps_3_0) windowLayerManagerRemote true AzureCanvasBackend direct2d AzureContentBackend direct2d AzureFallbackCanvasBackend cairo AzureSkiaAccelerated 0
Status: UNCONFIRMED → NEW
Component: Untriaged → Graphics
Ever confirmed: true
Product: Firefox → Core
Version: 33 Branch → Trunk
Disabling hardware acceleration (setting gfx.direct2d.disabled to true in about:config) seems to "solve" the problem. Seems that hardware acceleration is plying up here.
Still see this in a current nightly build?
I can still reproduce the slowness with enabled HWA in Nightly41.0a1 non-e10s.
Seems to work for me in 41.0a2 (2015-07-05) e10s and non-e10s. Might need confirmation on this.
I can still reproduce the super slowness with enabled HWA in Aurora41.0a2 & Nightly42.0a1 non-e10s/e10s.
Issue still exists for me on Aurora 41.0b4 when hardware acceleration is on.
Setting gfx.canvas.azure.backends = skia,cairo fixes the slowness
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