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Intel i5 750 quadcore @ 2.67 GHz running 64-bit Windows 7 Home Premium SP1 with 12 GB RAM. Firefox 9.0.1 using about 1.3 GB for 700 tabs in 23 Windows + Downloads window with 26 items. TID 9908 of 37 threads stack using 25.10% CPU:
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Intel Xeon W3540 @ 2.93GHz running 64-bit Windows 7 Enterprise with 6 GB RAM + Nvidia Quadro FX 1800 (driver 8.15.11.9038). Firefox 10.0.0.4411 using about 1.5 GB for 700+ tabs in 23+ windows. Of 43 threads, the firefox.exe stack using 25+% CPU and freezing the GUI:
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xul.dll!?FontListLength@gfxFontGroup@@UBEIXZ+0x47fe
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xul.dll!?GetType@ContainerLayer@layers@mozilla@@UBE?AW4LayerType@Layer@23@XZ+0x133ba
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xul.dll!?sLog@LayerManager@layers@mozilla@@1PAUPRLogModuleInfo@@A+0x692c
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xul.dll!?GetFontAt@gfxFontGroup@@UAEPAVgfxFont@@H@Z+0xb10
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xul.dll!?FontListLength@gfxFontGroup@@UBEIXZ+0x47fe
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xul.dll!?GetType@ContainerLayer@layers@mozilla@@UBE?AW4LayerType@Layer@23@XZ+0x133ba
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xul.dll!?FontListLength@gfxFontGroup@@UBEIXZ+0x4645
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xul.dll!NS_CycleCollectorForget2_P+0x11c61
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xul.dll!?GoodAlignmentLog2@gfxAlphaRecovery@@SAIXZ+0x2058
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xul.dll!NS_CycleCollectorForget2_P+0x10c18
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xul.dll!?GetBackendType@BasicLayerManager@layers@mozilla@@UAE?AW4LayersBackend@LayerManager@23@XZ+0x30fa
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xul.dll!NS_CycleCollectorSuspect2_P+0x3ae
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xul.dll!?UserToDevicePixelSnapped@gfxContext@@QBEHAAUgfxRect@@H@Z+0x1dbe
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xul.dll!?GetFirstChild@ContainerLayer@layers@mozilla@@UAEPAVLayer@23@XZ+0x422e
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xul.dll!??0gfxSize@@QAE@XZ+0xbb14
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xul.dll!?GetType@ContainerLayer@layers@mozilla@@UBE?AW4LayerType@Layer@23@XZ+0x157b5
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xul.dll!??1BasicLayerManager@layers@mozilla@@UAE@XZ+0x3ee
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xul.dll!?GetType@ContainerLayer@layers@mozilla@@UBE?AW4LayerType@Layer@23@XZ+0x157ce
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xul.dll!??0gfxSize@@QAE@XZ+0x2ff5
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xul.dll!NS_CycleCollectorForget2_P+0xb3a
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xul.dll!?KnownMemoryUsed@gfxASurface@@UAEHXZ+0x1103
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xul.dll!?ParseFontLanguageOverride@gfxFontStyle@@SAIABVnsString@@@Z+0x590
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xul.dll!??1BasicLayerManager@layers@mozilla@@UAE@XZ+0x1bb
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xul.dll!?GetType@ContainerLayer@layers@mozilla@@UBE?AW4LayerType@Layer@23@XZ+0xe0f7
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xul.dll!?GetType@ThebesLayer@layers@mozilla@@UBE?AW4LayerType@Layer@23@XZ+0x271a
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xul.dll!?GetUnderlineOffset@gfxFontGroup@@UAENXZ+0x240c
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xul.dll!??0gfx3DMatrix@@QAE@XZ+0x2884
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xul.dll!?AsShadowLayer@Layer@layers@mozilla@@UAEPAVShadowLayer@23@XZ+0x37d8
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MSVCR80.dll!_endthreadex+0x3b
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xul.dll!?GetFontAt@gfxFontGroup@@UAEPAVgfxFont@@H@Z+0x536c
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MSVCR80.dll!_endthreadex+0xc7
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xul.dll!?GetType@ThebesLayer@layers@mozilla@@UBE?AW4LayerType@Layer@23@XZ+0x20f3
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ntdll.dll!RtlInitializeExceptionChain+0x63
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xul.dll!?UpdateFontList@gfxFontGroup@@UAEXXZ+0x7719
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ntdll.dll!RtlInitializeExceptionChain+0x36
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xul.dll!?UpdateFontList@gfxFontGroup@@UAEXXZ+0xab6
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xul.dll!?UpdateFontList@gfxFontGroup@@UAEXXZ+0xa06
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xul.dll!?UpdateFontList@gfxFontGroup@@UAEXXZ+0xef60
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xul.dll!NS_CycleCollectorSuspect2_P+0x1d1
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xul.dll!?CanDraw2D@gfx3DMatrix@@QBE_NPAUgfxMatrix@@@Z+0xa880