Creating space hierarchy is slow

Synapse used to suck at creating rooms, so now Circles sleeps for 1.0 sec between every call to /createRoom. Because we have like 11 or 12 of these calls to create our full Space hierarchy, it takes about 15-20 seconds to configure the hierarchy. This does not make a super great impression on brand new users who are seeing the app for the first time.

Can we reduce or remove the sleeps to make this faster? How fast can we go without overwhelming the server?