Open Bug 1493609 Opened 6 years ago Updated 7 months ago

We're sometimes creating an about:blank document in the sidebar browser when the window opens

Categories

(Firefox :: General, defect, P2)

Product:
Firefox
Component:
General
Type:
defect

Tracking

()

Project Flags:
Performance Impact low
Tracking Flags:
Tracking Status
firefox64 --- affected

People

(Reporter: Gijs, Unassigned)

References

(Blocks 1 open bug)

Details

(Keywords: perf:resource-use, perf:responsiveness) 

Noticed from printf instrumentation when running talos tpaint on my macbook. This should be easy to fix - with the demise of loading webpages directly into that <browser>, there's no reason to load about:blank in it at all.

Of course, there's also no reason to really construct the browser element if the sidebar is hidden anyway, so there might be more that we can do than just sticking nodefaultsrc on the browser element...
Sounds like this has the potential for an easy win on tpaint and other startup benchmarks
Whiteboard: [fxperf] → [fxperf:p2]
Downgrading this a bit, though I might still just write a patch for this - because I can't reliably reproduce this at the moment. Not sure when it does/doesn't make an impact...
Summary: We're creating an about:blank document in the sidebar browser when the window opens → We're sometimes creating an about:blank document in the sidebar browser when the window opens
Whiteboard: [fxperf:p2] → [fxperf:p3]
Priority: P3 → P2
Severity: normal → S3
Performance Impact: --- → low
Keywords: perf:resource-use, perf:responsiveness
Whiteboard: [fxperf:p3]
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