1297725 - text input becomes very unresponsive in e10s mode when CPU is busy

Status: NEW

(Core :: Layout: Form Controls, defect, P3)

Description

[Ben Kelly [:bkelly, not reviewing]]

STR:

1) Launch your browser in e10s mode.
2) Start something on your computer that uses a lot of CPU.  For example, build firefox.
3) Try to type into text boxes or other text input fields.  Say, try to write a bug.

Our responsiveness seems to degrade much more in e10s than non-e10s.  With e10s I see input delays exceeding a second sometimes.  I know we can't make a user's computer faster, but we should at least degrade gracefully when the machine is under load.

Blake, is this a known issue?

Comment 1

[Blake Kaplan (:mrbkap) (inactive)]

I thought I was seeing this a lot about when you filed this, but I haven't seen it in a while.

Comment 2

[(no longer active)]

Did you profile this Ben?  If bug 1303749 is the only thing hurting perf here, we can just dupe this against that bug.

Comment 3

[Ben Kelly [:bkelly, not reviewing]]

Sorry, I didn't profile it and don't expect to have time in the near future.

Comment 4

[Jim Mathies [:jimm]]

Still seeing this?

Comment 5

[Ben Kelly [:bkelly, not reviewing]]

Still experiencing it in FF49.  Will check nightly.

Comment 6

[Ben Kelly [:bkelly, not reviewing]]

I still see poor typing responsiveness in e10s mode in 52.0a1 (2016-10-13) (64-bit).

Do we have telemetry for time to paint the character from when the OS level key press occurs?  Would be interesting to track this since its easily perceived when typing.

Comment 7

[Ben Kelly [:bkelly, not reviewing]]

FWIW, I disabled spellcheck in options->advanced->general, but I still have lots of typing jank.  Also, things like selecting text can jank.  This is on a FF50.0b8 I've been running for a day or two.

Comment 8

[(no longer active)]

Can you get a profile when you get the jank please?