I think this version of mod_perl does address the shared hosting issue. The page I read (which I can't find right now) compared it to PHP's safe mode and also said it was a replacement for suexec. By changing the MPM, you can still offer all the power that the current mod_perl allows. I don't know anything about performance for either version.
in reply to Re^4: More than mod_cgi less than mod_perl.
in thread More than mod_cgi less than mod_perl.