Does setting `apz.force_disable_desktop_zooming_scrollbars:false` make it smooth again (even though with some elements getting rendered slowly)? And does it then run properly with your refresh rate?
Bug 1601962 Comment 12 Edit History
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Does setting `apz.force_disable_desktop_zooming_scrollbars:true` make it smooth again (even though with some elements getting rendered slowly)? And does it then run properly with your refresh rate?