and see if you can come up with a better set of settings.
FWIW, I've been doing a bit of reading on the relationship between MSS and
MTU because ijfw has an MSS-Adjust setting that I was not previously aware
of.
Lars did a lot of work to optimize the fxwrap.sys driver performance. You
might want to discuss your speed issues with him. He might have some
ideas on how to troubleshoot is issue.