[tor-relays] Raspberry pi 3 relay performace

[tor_manager at autistici.org]

Hello everyone,
I have a tor relay running on a raspberry with raspbian 9 and tor 
version 3.4.8, everything is working fine for more then a year.
I noticed that the average download/upload is just 1.5 MB and the peak 
3.3 MB

The Bandwidth configuration is the following:
   BandwidthRate 9 MB
   BandwidthBurst 10 MB
   RelayBandwidthRate 9 MB
   RelayBandwidthBurst 10 MB
   MaxAdvertisedBandwidth 9 MB

It doesn't look the CPU or memory usage are too high.
Is this something normal? How can I improve the performance?

Thanks a lot