Speed up sliding sync by avoiding copies (#17670)

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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: Eric Eastwood <eric.eastwood@beta.gouv.fr>

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Erik JohnstonandEric Eastwood authored and GitHub committed 2024-09-06 11:12:29 +01:00

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tests/handlers/test_sliding_sync.py

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