1446534 - Lag when switching tabs on OSX with high resolution

Status: RESOLVED DUPLICATE of bug 1425916

(Core :: Graphics, defect, P3)

Description

[Dominik Moritz]

Attachment: Screen Shot 2018-03-16 at 13.49.06.png

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:60.0) Gecko/20100101 Firefox/60.0
Build ID: 20180315232954

Steps to reproduce:

I open a few tabs in Firefox and then try to switch between them. First, it takes a few millisecond before anything happens, then FF switches to the tab (that was already opened before). 


Actual results:

Instead of showing the page, I see a spinner in the middle of the page on a gray background. 


Expected results:

When the FF window is smaller, tab switching is instant. I believe this is related to the high resolution of my screen. I am using a 4K monitor on OSX.

Comment 1

[Ciprian Muresan [:cmuresan], Ecosystem QA, OOO until the 3rd of Jul needinfo @mcoman or @poiegas]

Hi Dominik,

Could you please take and post a performance profile using https://perf-html.io/ as you are reproducing this issue?

Comment 2

[Dominik Moritz]

Attachment: Firefox 2018-03-21 11.41 profile.sps.json.gz

Comment 3

[Ciprian Muresan [:cmuresan], Ecosystem QA, OOO until the 3rd of Jul needinfo @mcoman or @poiegas]

@Dominik, is this issue reproducible on older versions of Firefox? Or has it started recently? If it only started recently, could you please try to find a regression range using Mozregression tool?
Information on the tool is available at http://mozilla.github.io/mozregression/.

@Mike, could you please take a look at the performance profile from comment 2?

Comment 4

[Mike Conley (:mconley) (:⚙️)]

This looks like slow painting / layer upload to me:

https://perfht.ml/2pvOQqo

Comment 5

[Dominik Moritz]

Unfortunately, I won't have time to run the mozregression this week. I will try to get to it after next week unless this is confirmed to be a graphics issue. I believe it is as I don't have any problems when I use a smaller window.

Comment 6

[Dominik Moritz]

I don't think this issue started recently but probably came with the introduction of Quantum. I didn't use previous Firefox versions on a large monitor.

Comment 7

[Marco Castelluccio [:marco]]

Dominik, could you run mozregression?

Comment 8

[Dominik Moritz]

I'll have access to my large monitor again tomorrow. What version range should I look at?

Comment 9

[Marco Castelluccio [:marco]]

As the "bad" version, use today's date.
As the "good" version: if you remember a Firefox version where this didn't happen, use that; otherwise, use older dates until you find one that is good.

Comment 10

[Dominik Moritz]

It looks like it's much better now with some recent MacOS/Firefox updates. I still see the spinner from time to time but it's not as bad as it used to be. I'm going to close this issue and hope that further performance improvements for Firefox on MacOS resolve this issue entirely later.