Looks like this is the good ole copy on write sadness that happens with CoreGraphics. All of the time is being spent in: VectorImage::Draw() -> CGContextDrawTiledImage -> vm_fault() It's not obvious to me where the copy is happening.
Per policy at https://wiki.mozilla.org/Bug_Triage/Projects/Bug_Handling/Bug_Husbandry#Inactive_Bugs. If this bug is not an enhancement request or a bug not present in a supported release of Firefox, then it may be reopened.
Status: NEW → RESOLVED
Last Resolved: a day ago
Resolution: --- → INACTIVE
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