Andreas Kling 3f4de06fc2 LibWeb: Cache the root element font metrics when calculating them ...

The root element font metrics were getting queried again and again
during style computation. Before this change we would do some work to
recalculate them each time.

This patch simply caches them in a StyleComputer member. Since style
updates always start with the root element, we know that it'll be
up-to-date by the time we look at any other element.

Before this change, we were spending ~5% of CPU time on Google Groups
in root_element_font_metrics().

2023-05-08 12:13:20 +02:00

79 KiB

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