Add `filter={"lazy_load_members":true}` so that `/context` responds without timing out by returning just the state for the sender of the included event. Otherwise, the homeserver returns all state in the room at that point in time which in big rooms, can be 100k member events that we don't care about anyway. Synapse seems to timeout at about the ~5k state event mark. ## Dev notes Without `filter={"lazy_load_members":true}`, Synapse can only handle ~4k member events (probably state in general) before `/context` times out before it ever responds in the 180 second window. I'm only looking at the member count as a rough proxy but the number of member events + state will be more. Loads | Member count | Alias | Matrix.to | API request --- | --- | --- | --- | --- ❌ | 39k | `#matrix:matrix.org` | [🔗 ](https://matrix.to/#/!OGEhHVWSdvArJzumhm:matrix.org/$xo-tESRNP1Vg1RxLXIfmMeO6dA6-u9XuE2lv6toeKcw?via=matrix.org) | `https://matrix-client.matrix.org/_matrix/client/r0/rooms/!OGEhHVWSdvArJzumhm:matrix.org/context/$xo-tESRNP1Vg1RxLXIfmMeO6dA6-u9XuE2lv6toeKcw?limit=0` ❌ | 31k | `#openwisp_general:gitter.im` | [🔗 ](https://matrix.to/#/!RBzfoBeqYcCwLAAenz:gitter.im/$YFjmbmH0NRPmfVsPyxhM0jcK4RFR_CdCigtHSgCTLSc?via=matrix.org) |`https://matrix-client.matrix.org/_matrix/client/r0/rooms/!RBzfoBeqYcCwLAAenz:gitter.im/context/$YFjmbmH0NRPmfVsPyxhM0jcK4RFR_CdCigtHSgCTLSc?limit=0` ❌ | 16k | `#raspberrypi:matrix.org` | [🔗 ](https://matrix.to/#/!wOlkWNmgkAZFxbTaqj:matrix.org/$WMh_QauoyW6cjFDuUeNgsnUSgDn7C2XlrUnlijhdmdk?via=matrix.org) | `https://matrix-client.matrix.org/_matrix/client/r0/rooms/!wOlkWNmgkAZFxbTaqj:matrix.org/context/$WMh_QauoyW6cjFDuUeNgsnUSgDn7C2XlrUnlijhdmdk?limit=0` Loads with warm cache | 7.2k | `#element-android:matrix.org` | [🔗 ](https://matrix.to/#/!AZozoWghOYSIAfaZjJ:matrix.org/$Qmb8vmaD91PIM6ROfh-2jApPoJgH2Q7NnjiwRdiEPZE?via=matrix.org) | `https://matrix-client.matrix.org/_matrix/client/r0/rooms/!AZozoWghOYSIAfaZjJ:matrix.org/context/$Qmb8vmaD91PIM6ROfh-2jApPoJgH2Q7NnjiwRdiEPZE?limit=0` ✅ | 4k | `#nim-science:envs.net` | [🔗 ](https://matrix.to/#/!IpFtPSbgfrZrVcVyti:envs.net/$bDRop4yvjFOl3HMouAyx4mtau-JaAxvBUJ-MqftAm7E?via=matrix.org) | `https://matrix-client.matrix.org/_matrix/client/r0/rooms/!IpFtPSbgfrZrVcVyti:envs.net/context/$bDRop4yvjFOl3HMouAyx4mtau-JaAxvBUJ-MqftAm7E?limit=0` ✅ | 2.3k | `#nim-webdev:matrix.org` | [🔗 ](https://matrix.to/#/!EoyccMaVGwdqyfKMAL:matrix.org/$VdRyNb1F-gLdDP9nDYK7xAh_LcE822fEfDYWz5re8dE?via=matrix.org) | `https://matrix-client.matrix.org/_matrix/client/r0/rooms/!EoyccMaVGwdqyfKMAL:matrix.org/context/$VdRyNb1F-gLdDP9nDYK7xAh_LcE822fEfDYWz5re8dE?limit=0`
