tor relay hangs for 20 seconds periodically if domain from Address can not be resolved
tor version: 0.2.4.20-1 Debian sid i686
This problem started few hours ago. I checked many sources of problem. I even thought NSA delays my connections with Tor netwerk to fingerprint me :) Then I checked another tor instance, from tor browser, where no Address is specified, it worked fine.
The reason occurred to be in Down DNS server. Domain I specified for Address, was not resolved. I commented out Address, now Tor works fine!