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Commit f7ddfe1

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Speed up @cachedList (#13591)

This speeds things up by ~2x. The vast majority of the time is now spent in `LruCache` moving things around the linked lists. We do this via two things: 1. Don't create a deferred per-key during bulk set operations in `DeferredCache`. Instead, only create them if a subsequent caller asks for the key. 2. Add a bulk lookup API to `DeferredCache` rather than use a loop.

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changelog.d
- 13591.misc
synapse/util/caches

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`‎changelog.d/13591.misc`

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	`1`	+Improve performance of `@cachedList`.

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