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You could try using http://perfmonkey.com to run a simple scroll test on your webpage. If you are looking at more powerful tests, try out http://github.com/axemclion/browser-perf.

Here is the result I got - http://www.perfmonkey.com/#/trynow/results/travis/53664194

Here is a test I ran on bootstrap CSS library over all its versions - http://axemclion.github.io/bootstrap-perf

Cool, thanks! We get a thumbs down for mean frame time. It'd be great to know where we fit (%ile). Do you think it's because we use Bootstrap and SVGs?

This is what we are trying to solve. Using automated tool you know that "your site is painting slow or loading slow". But "Why" is something that is still missing in such tools.

Not as detailled as a manual one, but here is a good start : https://www.dareboost.com/en/report/550828b4e4b074fd5732f006

Thanks @sqs, we'll revert back to you soon with #perfaudit of sourcegraph.com