DOM node attribute element.expando is extremely slow in firefox
Categories
(Core :: JavaScript Engine, defect, P3)
Tracking
()
People
(Reporter: linuxcbon, Unassigned)
References
(Blocks 1 open bug)
Details
(Keywords: perf)
User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:66.0) Gecko/20100101 Firefox/66.0
Steps to reproduce:
Run http://dromaeo.com/?dom
in google chrome and firefox
Actual results:
GOOGLE 73.0.3683.75 element.expando: 13990.60runs/s ±113.75%
FIREFOX 66.0 (64 bits) element.expando: 875.20runs/s ±2.31%
Expected results:
element.expando should be much faster in Firefox.
Comment 1•6 years ago
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Seems to be about JS
https://perfht.ml/2U4N6oC
Updated•6 years ago
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Comment 2•6 years ago
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Hey Linuxcbon:
There's certainly some oddities you're highlighting, and it's good to see you giving us a hand. I think one of the most useful things you could do for us on your recent regression reports would be to use mozregression
to help us identify -when- things got slower. Mozregression will help you bisect when the regression shows up.
It would be particularly helpful to see if the same bisection range comes up in a number of the bugs you have opened recently: It would be good to know if you're finding one persistent issue, or of there are multiple at play here.
I tried to install mozregression in linux but it doesn't work
Bug : https://bugzilla.mozilla.org/show_bug.cgi?id=1503358
And I dont have windows, I only have linux, so I cannot use mozregression until that bug is corrected.
Comment 4•6 years ago
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linuxcbon, mozregression-gui isn't what you want anyway. Try the mozregression command-line tool.
When I get more time, why not, but I am really busy at the moment.
Can other testers help ?
Comment 6•6 years ago
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Anyway -- for this bug the most likely cause is wrappers. I doubt there is any easy fix.
Updated•2 years ago
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Comment 7•10 months ago
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Looking at our Dromaeo numbers on perfherder, I am just going to mark this as incomplete. We'd need to revisit this totally, but dromaeo isn't where our efforts are aimed these days.
Description
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