TWiki can be very slow on DreamHost

I am testing TWiki on dreamhost, level1 shared hosting. It works fine but it is very slow at time (over 15 seconds to see a topic) even though my Twiki has few topics (apart from the standard Twiki web) and pages are relative simple.

I know Dreamhost does not support mod_perl.

I am a little reluctant to use the TWikiCacheAddOn since it causes some problems.

Has anyone encountered similar problem?

Any idea?