[Zope] Problems uploading large attachments

I am using confera to help coordinate some development work I would like people to be able to upload large (100k) attachments into the system so the documents can be shared by people at different sites. I find that things work fine for small attachments, but for larger attachments, Zope is very slow in reading from the socket, and the browser often times out. Any ideas? Also, couldn't seem to run strace on the zope process. I started under strace but the system went bezerk opening sockets or something. Is there any way to start a single-process non-threaded zope server? (Oh, Zope 2.1.6, Linux glibc/2.0.something kernel,ix86). -- cary