Tested the CW aspect of this rig.
10? year old Dell optiplex 790 small form factor I5 8 gb windows 7 computer directly connected to the Hermes.
Default buffers , 250 ms delay between key closure and rf/sidetone out.
Buffers set low (audio and filters, filters set to low latency) no detectable delay, real time.
Things ran fine set that way, the computer is doing nothing else.
Its not a rocket ship of a computer.
With a faster computer, you could likely run it with much higher buffer settings.
For some reason, on 80 meters where I tried it, I could only get 2 watts out.
I did set it up for max power output.
I will have to try it on my I7 computer...