1294700 - Extreme lag/jank when repainting during text input after using Mobile Twitter

Status: RESOLVED DUPLICATE of bug 1295214

(Firefox :: Untriaged, defect)

Description

[Katelyn Gadd (:kael)]

Attachment: jank.memory-report.json.gz

Once I browse around in Mobile Twitter for 5-10 minutes in a pinned tab, Firefox begins taking upwards of 500ms to repaint in response to text events. While I type into the Description field here in Bugzilla right now, it's repainting at probably less than 5fps. This makes it pretty hard to input and edit text.

If I restart FF for a fresh session everything is fine, but after a minute or two of Mobile Twitter it consistently becomes terrible.

Oddly I'm not seeing anything strange in Cleopatra if I profile this, it seems like all the time is being spent in WaitForMultipleObjects. But I'm not sure if Gecko Profiler works correctly anymore.

Input into the address bar also lags (albeit less). Highlighting on context menus in FF also lags if I swipe my mouse over the menus.

Animations and scrolling in the compositor seem to be jank-free in this state, and hovers (like on the tab bar) also seem to be jank free. So that's weird.

Here's a cleopatra profile:
https://cleopatra.io/#report=0ae38e4b742645ee69df2cef6a0675689860674d

Attaching memory report

Comment 1

[Katelyn Gadd (:kael)]

about:support follows

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

Name: Firefox
Version: 50.0a2
Build ID: 20160811004013
Update Channel: aurora
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OS: Windows_NT 10.0
Multiprocess Windows: 1/1 (Enabled by user)
Safe Mode: false

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

Report ID: bp-8a43e334-83cf-4e05-9e85-8d5ab2160812
Submitted: 6 hours ago

All Crash Reports

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RAM: 6144

Diagnostics
AzureCanvasAccelerated: 0
AzureCanvasBackend: direct2d 1.1
AzureContentBackend: direct2d 1.1
AzureFallbackCanvasBackend: cairo

Crash Guard Disabled Features
D3D9 Video Decoder: Reset on Next Restart



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Experimental Features
---------------------

Comment 2

[Katelyn Gadd (:kael)]

I tried profiling with GPU and 'main thread I/O' turned on but the content process crashes when opening cleopatra now :/

Comment 3

[Katelyn Gadd (:kael)]

From the crash stacks opening Cleopatra that's 1271102, so unrelated.

Comment 4

[Katelyn Gadd (:kael)]

While this reproduces in the bugzilla text fields, other text fields do not consistently reproduce. I.e. the main text field on Twitter is jank-free, but the text field in the Reply modal is not. The Firefox address bar is janky, but the search field on the New Tab Page is butter-smooth.

If I start recording performance in the Performance tab of the Developer Tools on the bugzilla page, the input jank goes away while the recording is in progress. :/ It seems like maybe paints aren't being triggered for some reason? But it also feels like input events are not being processed promptly. If I look at the timeline in cleopatra, I see big bursts of paints with large gaps inbetween, which doesn't make sense given that I am literally spamming the keys on my keyboard at around 100-140wpm.

I can also reproduce this with regular web twitter (https://twitter.com/) if I scroll around in my feed long enough, but mobile twitter seems worse (https://mobile.twitter.com/).

Comment 5

[Katelyn Gadd (:kael)]

If I disable e10s this goes away and responsiveness is consistently good for input events.

Comment 6

[:Gijs (he/him)]

Does this happen on a clean profile? If so, any chance you could bisect this with mozregression?

Comment 7

[Katelyn Gadd (:kael)]

I tried bisecting with mozregression but it takes a while to reproduce. I'll give it another go now that I have a better sense of how to reproduce it. It's kinda impossible to reproduce on a clean profile since the problem is essentially 'all your other tabs suck with Twitter open' - i.e. the impact is not noticeable unless you go through your regular browsing routine for a half hour.

I'm trying Release channel FF right now to see if it works better, since that will give me a regression window to drill down into.

Comment 8

[Virtual_ManPL [:Virtual] 🇵🇱 - (please needinfo? me - so I will see your comment/reply/question/etc.)]

This bug is probably a duplicate of bug #1295214.
Please retest to see if it's fixed in latest Nightly (51.0a1 [2016-08-27]),
if not, reopen this bug.