Here is what Top on our Tor relay is doing today:

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME    COMMAND       
 1163 _tor      20   0  628m 286m  34m R 106.3 15.3   4693:47 tor 

Logs filled with:

Sep 03 04:12:20.000 [warn] Your computer is too slow to handle this many circuit creation requests! Please consider using the MaxAdvertisedBandwidth config option or choosing a
more restricted exit policy. [5700 similar message(s) suppressed in last 60 seconds]