mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Nick Gerleman
2d1db71bc0
Summary: Pull Request resolved: https://github.com/facebook/react-native/pull/52308 Experimentation shows, that we very heavily rely on the global text cache for performance (not sure how much of this is invalidation, vs repeated text, or revisiting previous surfaces). This adds a global LRU cache, of prepared layouts, given a specific AttributedString and constraints. This is similar to the existing cache, with the caveat, that we need to have separate entries for any display states, instead of just those that effect metrics. I sized it at 200 elements for now, since an Android `Layout` is much heavier than a `Size` (in practice, each seem to weight 1-3KB (though this will be significantly reduced with future change to move from `SpannableStringBuilder` to `SpannableString` and also contributes to the global JNI ref table, but set this up to be customizable via flag, so we can experiment, on perf impact, vs memory. Changelog: [Internal] Reviewed By: rshest Differential Revision: D77341994 fbshipit-source-id: b453250dc475f6a281a3260b876bf80f301dd5dd