timbugzilla Reporter
	Description • 7 years ago

On a 4K monitor with Touch density browser theme the tab close animations are very janky/jerky. It is not visible normal or compact themes.

This behaviour started a few days ago.

This has been reproduced with a new blank profile.

This has been reproduced at 1080p resolution by a Mozillazine user:

http://forums.mozillazine.org/viewtopic.php?p=14770534#p14770534

I am using Win 10 x64 and the x64 nightly browser. My platform has an Intel i5-4670 CPU and an AMD HD 7790 GPU. See attachment about:support output.

	Leman Bennett [Omega]
	Comment 1 • 7 years ago

Easy STR:

1. Switch to Touch Mode Density in 'Customize'.

2. Open a few Tabs.

3. Close the tabs before the last tab on the bar.

Observe the jank. Its much less pronounced in other tab density modes. But very noticeable in Touch Mode.

	timbugzilla Reporter
	Comment 2 • 7 years ago

This happens on 57b8 too.

	timbugzilla Reporter
	Comment 3 • 7 years ago

The test build from Bug 1397092 (High Cpu/GPU usage due to "Ping Pong" loading indicators in Firefox 57 affecting browser performance) comment #221 seems to fix this bug:

https://bugzilla.mozilla.org/show_bug.cgi?id=1397092#c221

https://queue.taskcluster.net/v1/task/WXPS-VFDRYqSTknKbgOLcg/runs/0/artifacts/public/build/target.zip

	Mike Taylor [:miketaylr]
	Comment 4 • 7 years ago

Let's see how this looks when patches from 1397092 or 1406414 land (AFAICT, they haven't yet).

	Mike Taylor [:miketaylr]
	Comment 5 • 7 years ago

Bug 1406414 has landed, can you test if things are any better in the latest nightly, timbugzilla?

	timbugzilla Reporter
	Comment 6 • 7 years ago

(In reply to Mike Taylor [:miketaylr] (58 Regression Engineering Owner) from comment #5)
> Bug 1406414 has landed, can you test if things are any better in the latest
> nightly, timbugzilla?

It's a bit better, but still not smooth. Normal density UI is much, much smoother still.

	timbugzilla Reporter
	Comment 7 • 7 years ago

(In reply to Mike Taylor [:miketaylr] (58 Regression Engineering Owner) from comment #5)
> Bug 1406414 has landed, can you test if things are any better in the latest
> nightly, timbugzilla?

Here's a profile that includes closing a few tabs:

https://perfht.ml/2xJtmsd

	Mike Taylor [:miketaylr]
	Comment 8 • 7 years ago

Jim, can you repro on your new fancy laptop?

	Jim Mathies [:jimm]
	Comment 9 • 7 years ago

Yes, can confirm The tab sliding animation janks. Profile of 5 closed tabs:

https://perfht.ml/2B9Qm4B

	u595893
	Comment 10 • 7 years ago

any chance this makes into ESR60?