@Reporter: Could you please provide sample URL or test case with click events to test this issue. This would help in further triaging of the issue.

Thanks!

Unfortunately I cannot provide details for the system but I have noticed that the issue is not happening in FireFox and we are currently asking our client base to downgrade to version 63 or move to vivaldi. 

On one of our products we have a JQuery Dialog with a bootstrap tab inside, simply clicking these tabs will eventually cause a lag for a few seconds. 

I have attached the chrome performance export

Deleted: Profile-20180216T090601.json 12.5 MB

Profile-20180216T090601.json 12.5 MB View Download

Thank you for providing more feedback. Adding requester "sc00335628@techmahindra.com" to the cc list and removing "Needs-Feedback" label.

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

It will not be possible to test this issue from TE end without any sample file/URL(as per comment#4). Hence adding TE-NeedsTriageHelp label and requesting someone from Blink>Input team to please have a look at the performance log attached.

Thanks!

This isn't an input issue but perhaps a JS performance problem. However nothing from the trace seems to point to that. If we don't have a reproduction URI it is really hard for us to advise.

The trace indicates that javascript was being executed here:

{frame: "0x3947780421f0",
 functionName: "mouseup",
 scriptId: "2231",
 url: "http://localhost/Scripting/bundles/core?v=BEoPJUnzjsJnDcMNm1cnQDy82tQHkPRySKASzZbjNLc1",
 lineNumber: 1,
 columnNumber: 104908}

This function took 1,861.719 ms of CPU time. So it is really poorly behaving JS function.

Indeed. There are also nested mouse move events at the same time. To re-iterate: Without an example URL or workload this is not actionable.

Please reopen if you can provide this.