Performance under glassfish-any tuning suggestions?

Hi All-

I’ve converted one of the applications from mri to jruby, and used
warbler
to deploy it under glassfish v2. Everything works, but performance
under
glassfish is just awful compared to mri/mongrel or jruby/mongrel.

I’ve already enabled thread pooling from withing the glassfish admin
console, as well as upped the memory and permgen(as suggested by
http://wiki.jruby.org/wiki/Performance_Tuning)…is there anything else
I
can do to improve the performance of jruby under glassfish?

FYI, I’m using jruby 1.1.4 and jruby rack 0.9.2 from warbler 0.9.11
Thanks,
Mike Kohout