element-hq / element-hq/synapse
Federation /event is slow for large rooms with non-shared history
Open
A-Messages-Endpoint
A-Performance
S-Minor
T-Defect
- Dominant language
- Python
- Stars
- 4.6k
- Forks
- 600
- Avg merge
- 5d 22h
- Merged PRs (30d)
- 51
Description
This issue has been migrated from [#8554](https://github.com/matrix-org/synapse/issues/8554).
---
This is because `filter_events_for_server` can't take the fast path of:
https://github.com/matrix-org/synapse/blob/921a3f8a59da0f8fe706a22627f464a74b54c992/synapse/visibility.py#L350-L366
and instead loads *all* members from the DB:
https://github.com/matrix-org/synapse/blob/921a3f8a59da0f8fe706a22627f464a74b54c992/synapse/visibility.py#L368-L378
This particularly effects rooms that are bridged to busy IRC channels
We often do `/event` after doing `/state_ids`, so #7893 is related.
Contributor guide
Assessment
This issue has not been assessed yet.