Well with the lxi benchmark tool (updated to 1.15) it seems the MX180TP is quite nippy...
lxi benchmark --address a.b.c.d --port 9221 --raw
Benchmarking by sending 100 ID requests. Please wait...
Result: 358.4 requests/second
For actual time to change to a command I think I'd need to try and work something out over serial though.