Filippo Fiorani wrote:

I read in OTRS manual that using perl modules is faster than pure CGI.

OTRS always uses Perl modules. I believe you mean mod_perl (the apache module) instead.

How can I check which one I'm using? Once I've checked, how can I switch from either one to the other?

Check what your OTRS config for apache looks like. If your config is using PerlHandler ModPerl::Registry, then you're using mod_perl. There are a few example configs in ~otrs/scripts/. You can switch by changing your apache config. Nils Breunese.