Have you tried using a clean chrome profile? Any particular sites it is happening on?

Can you collect a chrome://tracing trace during the lagginess?

There is no particular site or video where it happens.

I've tried different options and all show the same behaviour
- Private mode, Guest mode
- Chrome canary (no profiles at all)
- Opera (which uses Chromium)

Since the tracing doesn't show the time, but only the seconds, I've observed the time when the lagginess happens, wrote it down and compared it to the tracing-record. 

It matches exactly with the recordings.

Attached you can find 2 recordings. 
One where I watched a youtube video and moved the mouse  a few times during playback. 

The other one I recorded during a normal browsing and scrolling on a website.

Deleted: trace_chrome_highsierra_lag_youtube.json.gz 9.0 MB

trace_chrome_highsierra_lag_youtube.json.gz 9.0 MB Download

Deleted: trace_chrome_highsierra_lag_scrollwebsite.json.gz 8.5 MB

trace_chrome_highsierra_lag_scrollwebsite.json.gz 8.5 MB Download

Thank you for providing more feedback. Adding requester "eae@chromium.org" to the cc list and removing "Needs-Feedback" label.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

Assigning Blink>Scroll, but feel free to re-assign to appropriate team once
the trace is analyzed and more clear idea about the problem is identified.

Tested the issue on MAc os 10.13 Beta High Sierra using chrome M62 #62.0.3202.89 and M64 #64.0.3264.0 and followed the steps mentioned in comment #0.

Attached screencast for reference.

@add-- Could you please check attached screencast and confirm us if we have missed any steps in reproducing the issue and also please help us in traiging this issue.

Thanks!

Deleted: 782702.mp4 11.3 MB

	782702.mp4 11.3 MB View Download

Hey hdodda,

as I can see in your amazon-demo. you've moved the mouse before you started scrolling. Right? So, that moment you moved the mouse, the browser already should have lagged, but it can't be seen because there's no movement like scrolling.

In your youtube-demo you did everything right, as far as I can see, but strangely the lag doesn't occur. 

Attached you can find my screen recording demoing the youtube-playback lag.
The youtube-example I used was this one: https://www.youtube.com/watch?v=Ja_GMU7-sjs

Cheers,
Adis

Deleted: youtube_lag.mp4 4.6 MB

	youtube_lag.mp4 4.6 MB View Download

Thank you for providing more feedback. Adding requester "hdodda@chromium.org" to the cc list and removing "Needs-Feedback" label.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

Also I noticed that you're using 10.13 beta, while I'm on 10.13.1, but I don't know how much of a difference this generally is.

Could it be that Apple secretly pushed a hotfix for this issue? I noticed that the lag doesn't occur anymore.

I didn't do anything on my side.

As per comment#12 issue is no longer reproducible. Hence marking this issue as wont-fix. 

@Reporter: Please feel free to raise a new issue if issue occurs again.