[Twisted-Python] Performance of PB, XML-RPC and SOAP (ZSI version)

[Chaz.]

I was wondering if anyone has performance information for PB, XML-RPC
and/or ZSI's SOAP? I am trying to find out what I should be expecting
for raw performance.

I have done some raw performance of gSOAP doing an echo of 1-byte
messages and get around 500/second. I am trying to figure out the "hit"
I am going to take using Python, Twisted, and the 3 protocols.

Thanks in advance,
Chaz