[Dovecot] flat file in tmpfs for dict quota

I'm using dict quota like so:

quota = dict:User quota::file:/[path]/quotas/%u

[path]/quotas/ is a tmpfs.

The idea is to do less work on disk. Other than forcing dovecot to rebuild quotas on a reboot, are there any downsides?

Thanks, Ken

-- Ken Anderson Pacific Internet - http://www.pacific.net