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?

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

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

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

Still seeing this?

Still experiencing it in FF49. Will check nightly.

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.

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.

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