[OT, Q] Fast RPC library?

[Sungjin Chun]

Hi, This is off-topic but I cannot help but to ask ... :-)

My question is, do you know any simple to use(like XML-RPC) and fast  
(10K/sec in PowerPC G4) RPC library? My intention is improving  
existing account server (whose performance is about 10K/sec in  
PowerPC G4, ie, 10K request processing per second and uses custom,  
platform dependent binary protocol.) My previous try with XML-RPC was  
failed because I can only get 1K/sec only.

Thanks in advance.

PS)
I'm very interested in GNUstep's DO but I cannot make the server  
scalable; I mean I do not know how to make scalable/high performant  
DO server. Also, I cannot make linux NSS module(such as libnss_files  
like thing) can use GNUstep(I only get segmentation fault. May be I  
have to initialize some part of system for GNUstep but I don't know  
this too.)