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Increase the size of the style sharing cache to 31.
Still a lot of guesswork here, but this does seem to get us better sharing. See https://bugzilla.mozilla.org/show_bug.cgi?id=1369621 for some data.
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2 changed files with 12 additions and 16 deletions
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@ -84,8 +84,16 @@ use stylist::{ApplicableDeclarationBlock, Stylist};
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mod checks;
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/// The amount of nodes that the style sharing candidate cache should hold at
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/// most.
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pub const STYLE_SHARING_CANDIDATE_CACHE_SIZE: usize = 8;
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/// most. We'd somewhat like 32, but ArrayDeque only implements certain backing
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/// store sizes. A cache size of 32 would mean a backing store of 33, but
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/// that's not an implemented size: we can do 32 or 40.
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///
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/// The cache size was chosen by measuring style sharing and resulting
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/// performance on a few pages; sizes up to about 32 were giving good sharing
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/// improvements (e.g. 3x fewer styles having to be resolved than at size 8) and
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/// slight performance improvements. Sizes larger than 32 haven't really been
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/// tested.
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pub const STYLE_SHARING_CANDIDATE_CACHE_SIZE: usize = 31;
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/// Controls whether the style sharing cache is used.
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#[derive(Clone, Copy, PartialEq)]
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