element-hq / element-hq/synapse
`maybe_get_notice_room_for_user` can take a lot of memory
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Description
This issue has been migrated from [#13247](https://github.com/matrix-org/synapse/issues/13247).
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This gets called whenever a user comes online, and fetches all the rooms for the user to search for the notice room. For large accounts this is a *lot* of state.
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