Performance problems with mod_WebObjects.so, FastCGI

Hi,

I have a problem with performance of WebObjects Adaptors on SuSe Linux 
9.1
using Apache2 and WebObjects 5.2.3.

I compiled and used the mod_WebObjects.so and it takes twice the time 
of the
normal CGI-BIN adaptor.  Using the FastCGI adaptor results in a 
slightly higher
time than the CGI-BIN adaptor.

So it seems the CGI-BIN adaptor performs best of the three and that 
seems very
odd to me since that is not very fast to start with.

Has anyone made similar experiences?
Any known pitfalls I may have overlooked?
Configuration problems to observe when using either of the two?

Thanks in advance.

J.L.Simon