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Unverified Commit d5accec2 authored by Erik Johnston's avatar Erik Johnston Committed by GitHub
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Speed up sliding sync by avoiding copies (#17670) 


We ended up spending ~10% CPU creating a new dictionary and
`_RoomMembershipForUser`, so let's avoid creating new dicts and copying
by returning `newly_joined`, `newly_left` and `is_dm` as sets directly.

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Co-authored-by: default avatarEric Eastwood <eric.eastwood@beta.gouv.fr>
parent de3363ef
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