Hi roger, thanks for the bug report, do you mind provide a profile to us so we can investigate more? It's basically about using the Gecko Profiler https://profiler.firefox.com/ to take a profile and share with us. And also do you mind using moz-regression (https://mozilla.github.io/mozregression/) to see at which changeset caused it?
Bug 1599246 Comment 5 Edit History
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Hi roger, thanks for the bug report, do you mind provide a profile to us so we can investigate more? It's basically about using the Gecko Profiler https://profiler.firefox.com/ to take a profile and share with us. And also do you mind using moz-regression (https://mozilla.github.io/mozregression/) to see which changeset caused it?