Thanks for taking the time to report this issue, can you please capture a performance profile and attach it to this bug? You can get more info on how to install and use the Cleopatra add-on (that helps you get the performance profile) by going to: https://developer.mozilla.org/en-US/docs/Mozilla/Performance/Profiling_with_the_Built-in_Profiler https://perf-html.io/ Please note that this addon works only with FF Nightly, so this means you need to be able to reproduce the issue on Nightly first. You can download the latest Nightly from https://www.mozilla.org/en-US/firefox/channel/desktop/
Bug 1646976 Comment 3 Edit History
Note: The actual edited comment in the bug view page will always show the original commenter’s name and original timestamp.
Jonas H, thanks for taking the time to report this issue, can you please capture a performance profile and attach it to this bug? You can get more info on how to install and use the Cleopatra add-on (that helps you get the performance profile) by going to: https://developer.mozilla.org/en-US/docs/Mozilla/Performance/Profiling_with_the_Built-in_Profiler https://perf-html.io/ Please note that this addon works only with FF Nightly, so this means you need to be able to reproduce the issue on Nightly first. You can download the latest Nightly from https://www.mozilla.org/en-US/firefox/channel/desktop/