[tor-relays] Improving throughput on weak CPU?

Hi there, I'm the operator of the following two exit nodes:

https://metrics.torproject.org/rs.html#search/family:94C268630BEDCB64E7F8881...

My CPU is an Intel C2750 (8 cores total), which supports hardware accelerated AES yet a single process still maxes out at only ~150mbit/s.

To get the most out of the machine and my single IPv4 address, I simply ran another relay which works fine, and now I'm averaging at around ~315mbit/s.

Is there anything else I can tweak to improve throughput without having to order more IP addresses? I'm running Arch with stock 5.2.9 linux kernel.

That being said, true multi threading would be much appreciated and would help people like me a lot :-)

Regards,

Jochen