Open Bug 2085589 Opened 21 days ago Updated 20 days ago

ScrollContainerFrame is rather bloated.

Categories

(Core :: Layout: Scrolling and Overflow, defect, P3)

Product:
Core
Component:
Layout: Scrolling and Overflow
Type:
defect

Tracking

()

People

(Reporter: emilio, Unassigned)

References

(Blocks 1 open bug)

Details

I did some profiling speedometer3 for bug 2085386, and ScrollContainerFrame stands out as:

  • Very very common in some subtests.
  • Very very large.

It seems we could improve some cache locality (and memory usage) by shrinking it. I assume most of the usage is actually overflow: hidden. Looking at class layout in Searchfox seems most of those fields won't be used when not scrolled.

PERF key word?

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