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@@ -557,6 +557,11 @@ class EventCreationHandler(object):
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See self.create_event and self.send_nonmember_event.
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"""
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+ # We limit the number of concurrent event sends in a room so that we
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+ # don't fork the DAG too much. If we don't limit then we can end up in
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+ # a situation where event persistence can't keep up, causing
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+ # extremities to pile up, which in turn leads to state resolution
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+ # taking longer.
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with (yield self.limiter.queue(event_dict["room_id"])):
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event, context = yield self.create_event(
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requester,
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