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Issue 761593 link

Starred by 4 users
Status: Duplicate
Merged: issue 760886
Owner:
l...@chromium.org
Closed: Sep 2017
Cc:
sunn...@chromium.org
mac-bugs-priority@chromium.org
dsinclair@chromium.org
Components:
EstimatedDays: ----
NextAction: ----
OS: Mac
Pri: 1
Type: Bug-Regression



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DevTools: console scrolling performance regression; scrolling is choppy, slow, laggy

Project Member Reported by l...@chromium.org, Sep 2 2017 
OS: Mac

What steps will reproduce the problem?
(1) Open DevTools Console
(2) Produce a ton of logs to give a lot of scroll height, e.g.
for (var i=0; i < 10000; i++) console.log(Math.random())
(3) Scroll around, do some flinging

What is the expected result?
Frame rate and scrolling should appear smooth (stay around 30 - 60fps)

What happens instead?
Frame rate drops considerally after a fling (~10fps)

Manually bisected to:
https://chromium.googlesource.com/chromium/src/+/9b8fb34db903643b759635086dcf0da90b1e3082

Comment 1 by l...@chromium.org, Sep 2 2017

Labels: OS-Mac
cc'd sunnyps@ since the bisect suspects your commit.  Would you happen to know why this might be occurring, and whether your change is the root cause?

A friend an I can repro this on our Macbooks.  If a better repro would be helpful, let me know and I can try to reduce the console example into a smaller working case.

Comment 2 by l...@chromium.org, Sep 2 2017

Status: Assigned (was: Available)

Comment 3 by l...@chromium.org, Sep 2 2017 

Attached a screen recording as well
consolePerfReg3.mov
6.0 MB Download

Comment 4 by sdy@chromium.org, Sep 5 2017 

 Issue 761659  has been merged into this issue.

Comment 5 by sdy@chromium.org, Sep 5 2017

Labels: ReleaseBlock-Dev
This is pretty bad for me e.g. in Gmail.

Comment 6 by sunn...@chromium.org, Sep 5 2017 

I'm working on a fix for this. The next dev release is tomorrow so we'll have to merge to 61 too, or merge the fix.

Comment 7 by sunn...@chromium.org, Sep 5 2017

Mergedinto: 760886
Status: Duplicate (was: Assigned)
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