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by pcwalton 3144 days ago
If it is indeed style recalculation that is causing the problem, then Quantum (57) may well solve the issue, as Stylo both improves the dynamic restyling behavior (the style sharing optimization is more flexible) and accelerates the slow case in which restyling needs to occur from scratch (via parallelism). I can't promise anything without being able to reproduce, of course.

Naturally, like all browser engines, Gecko takes performance on popular sites such as Facebook very seriously.