I'm tagging comment 3 as 'obsolete' so that it autocollapses (and since it's probably not needed, for now). Here's a profile taken on my machine: https://perfht.ml/2RMJbr9 There are multiple 200-300ms reflows during pageload there that look pretty bad. They're in pretty deeply nested grid/flexbox layout.
Bug 1524056 Comment 5 Edit History
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I'm tagging comment 3 as 'obsolete' so that it autocollapses (and since it's probably not needed, for now). Here's a profile taken on my linux Thinkpad P50 laptop: https://perfht.ml/2RMJbr9 There are multiple 200-300ms reflows during pageload there that look pretty bad. They're in pretty deeply nested grid/flexbox layout.