If you only use it for NAT traversal and don't need to hide your location you can setup a single onion service. This way your server makes a direct connection to the rendezvous points which reduces the number of hops from 6 to 3 which should increase the speed and reduce the load on the Tor network.

This can be configured with two options.

HiddenServiceNonAnonymousMode 1 HiddenServiceSingleHopMode 1

Unfortunately you can't use it with the Tor Browser Bundle as you need to disable all client-side services on your Tor instance, including setting SOCKSPort to "0".