1278501 - Firefox hangs for several seconds in ElementRestyler deck['performance-view'].vbox['performance-pane']...

Status: RESOLVED WONTFIX

(DevTools :: Performance Tools (Profiler/Timeline), defect, P2)

Description

[Jukka Jylänki]

Attachment: page_hangs.png

Trying to use current Firefox Nightly performance tools to profile the causes of animation stuttering on a page. The page is a WebGL application that does not interact with the DOM/CSS styles while it is running, but just does WebGL rendering in requestAnimationFrame.

While the profiler is enabled, the page keeps hanging for ~3 seconds at a time, which makes profiling the application stuttering behavior difficult.

Attached a screenshot of the profiler in action when these kind of stuttering occurs. Looking at the causes of this, it seems that the profiler view is restyling itself that takes a long time? (based on assumption that the names 'performance-view' and 'performance-pane' relate to the performance developer tool?)

Comment 1

[Greg Tatum [:gregtatum]]

The way the tool is built, as data streams in, it does stream information back to the devtools client and restyle the interface with the new information. It looks like you have a lot of GC markers in there. Do you think this is a regression? I'm going to go ahead and set it to P2 for right since this shouldn't happen, but it might be due to some known performance issues that we'll eventually fix. If it's because of a regression I'd like to investigate it and set it to a P1.

Comment 2

[Julien Wajsberg [:julienw]]

Now that we replaced the old performance panel by the Firefox Profiler (see Bug 1668219) we're closing bugs related to this. If you see similar issues on the new profiler, please file another bug, and we'll be happy to have a look.

Filter on MASSCLOSEOLDPERFTOOLBUGS.