Use ultrajson when possible. Add option to turn off freezing of events.

Make HTTP clients use connection pools.

Remove a deep copy

SYN-390: Don't modify the dictionary returned from the database here either

SYN-390: Don't modify the dictionary returned from the data store

Add a cache for the presence list

Add a cache for get_push rules for user, fix cache invalidation

backfill fixes

Make joining #matrix:matrix.org over federation quicker

Enable changing the interface the metrics listener binds to

Improve presence performance in loadtest

Make the appservice use 'users_in_room' rather than get_room_members …