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> Text rendering is extremely difficult. Even today, Chrome/Firefox are not fully hardware accelerated on this front.

On the other hand native toolkits have had hardware-accelerated text rendering for years if not decades. Browsers are not actually good at being a UI toolkit. They are good at handling a variety of inputs of a variety of questionable quality with a variety of usage patterns. They are good at being very defensive in the face of arbitrary inputs. They are a great catch-all, but as a result they are never actually fast at anything in particular.

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