element-hq / element-hq/synapse
Convert LruCache linked lists into Rust
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Description
This issue has been migrated from [#13733](https://github.com/matrix-org/synapse/pull/13733).
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As we can spend quite a lot of time messing around with linked lists in Rust. This speeds up huge `@cachedList` queries by 2x.
This is step 1. in the plan to move the full LruCache into Rust.
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