Closed Bug 984931 Opened 12 years ago Closed 8 years ago

Un-collapsing the profile tree in Cleopatra is very slow

Categories

(Core :: Gecko Profiler, defect)

Product:
Core
Component:
Gecko Profiler
Platform:
x86_64
Linux
Type:
defect
Priority:
Not set
Severity:
normal

Tracking

()

Status:
RESOLVED WORKSFORME

People

(Reporter: smaug, Unassigned)

References

Details

I'm trying to look at http://people.mozilla.org/~bgirard/cleopatra/#report=8e78388aa31ba35b58dec7ecba48ca70af22d59e Un-collapsing the root has so far taken about 10mins. We had similar/same issues last autumn, but the time was spent in different place, since bug 928403 helped quite a bit. Based on (Zoom) profile Cleopatra triggers _tons_ of restyling, and all the nth child etc stuff need to be recalculated. This could be bad css in Cleopatra or some missing optimization in Gecko.
Oh, and now that the tree is un-collapsed, scrolling it is slow, since tons of restyling is triggered again.
(Looks like Cleopatra works on Chrome too, and it is slow there too)
I have a patch somewhere that only creates DOM nodes for those lines that we show (and a bit of buffer around them) which completely removes that performance bottleneck. I should get them landed.
Blocks: 1329178
Status: NEW → RESOLVED
Closed: 8 years ago
Resolution: --- → WORKSFORME
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