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MatrixSynapse/changelog.d/11974.misc

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Optimise calculating device_list changes in `/sync`. (#11974) For users with large accounts it is inefficient to calculate the set of users they share a room with (and takes a lot of space in the cache). Instead we can look at users whose devices have changed since the last sync and check if they share a room with the syncing user.
2022-02-15 16:01:00 +01:00
Optimise calculating device_list changes in `/sync`.