kalviskajaks Reporter
	Description • 9 years ago

Very bad performance on this webpage with e10s switched on.
http://www.jshine.net/astronomy/dark_sky/

	Tracy Walker [:tracy]
	Comment 1 • 9 years ago

Please describe the performance issue what you are seeing versus what you expect to see.

	kalviskajaks Reporter
	Comment 2 • 9 years ago

With e10s enabled
A message pops up at the top. 
"A web page is causing Nightly to run slowly."
Whole tab is unresponsive for long amounts of time, any attempt to interact with the map after the browser starts to respond makes the webpage unresponsive again.

With e10s disabled
Tab and webpage is responsive, interactions with map do not stop the tab from responding to input. Map stutters a bit if moved, but does not hang like the e10s version does.

	George Wright (:gw280) (needinfo me!)
	Comment 3 • 9 years ago

I think this might be a dupe of https://bugzilla.mozilla.org/show_bug.cgi?id=1144906

	Jim Mathies [:jimm]
	Comment 4 • 9 years ago

- not webgl related
- not e10s related
- perf also sucks in IE

	kalviskajaks Reporter
	Comment 5 • 9 years ago

- not e10s related

Umm "e10s on" is totally unresponsive on that page, while "e10s off" is slow but atleast the browser doesn't **** itself?

- perf also sucks in IE

IE is smooth as butter.

	Jim Mathies [:jimm]
	Comment 6 • 9 years ago

Would you mind posting your about:support text?

	kalviskajaks Reporter
	Comment 7 • 9 years ago

Application Basics
------------------

Name: Firefox
Version: 40.0a1
Build ID: 20150421092928
Update Channel: nightly
User Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:40.0) Gecko/20100101 Firefox/40.0
Multiprocess Windows: 1/1 (default: true)

Crash Reports for the Last 3 Days
---------------------------------

Report ID: bp-50e248cd-ae58-4042-9a81-d1adc2150422
Submitted: 13 hours ago

Report ID: bp-6419cd38-b988-4d70-9216-3eaf92150422
Submitted: 13 hours ago

All Crash Reports (including 4 pending crashes in the given time range)

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JavaScript
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Accessibility
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Library Versions
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NSPR
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End Date: 1398805091465
Homepage:

	Tracy Walker [:tracy]
	Comment 8 • 9 years ago

kalviskajaks, I know it's a pain, but can you manually disable all of your add-ons, restart the browser, then check performance at the dark sky page in e10s?

	kalviskajaks Reporter
	Comment 9 • 9 years ago

Its adblock plus.

adblock plus disabled + disabled e10s = webpage is very smooth
adblock plus disabled + enabled  e10s = webpage is very smooth
adblock plus enabled  + disabled e10s = slow but still usable
adblock plus enabled  + enabled  e10s = total freeze fest

no other addons had any noticeable impact.

	Tracy Walker [:tracy]
	Comment 10 • 9 years ago

Excellent! Thank you for narrowing it down to Adblock Plus.  

triage: is there a known dupe in the adp realm?

	Jerod Lycett
	Comment 11 • 9 years ago

Has this been tested recently?

	Wladimir Palant
	Comment 12 • 9 years ago

This webpage is producing thousands of content policy calls. So while this should be a dupe of bug 1161798 to some degree, it's still very slow even with Adblock Plus 2.7.

	Tracy Walker [:tracy]
	Comment 13 • 9 years ago

As Wladimir points out, there is still a notable performance difference between e10s and non-e10s with latest Nightly on this test page.  But iirc how bad this was before, there is improvement now.

	Wladimir Palant
	Comment 14 • 9 years ago

I identified https://issues.adblockplus.org/ticket/3473 to be the underlying bug. No idea how this went unnoticed for so long but there is no relation to E10S.

	:Gijs (he/him)
	Comment 15 • 8 years ago

(In reply to Wladimir Palant from comment #14)
> I identified https://issues.adblockplus.org/ticket/3473 to be the underlying
> bug. No idea how this went unnoticed for so long but there is no relation to
> E10S.

Based on https://issues.adblockplus.org/ticket/3473, resolving this as fixed! :-)