I can't say (yet) it is any slower/faster than twig because I'm still in the process of rolling out egroupware. So it is maybe a little early to compare. Then again, speed also depends on so many factors (your network, server hardware, size of mailboxes, other web apps running on your server ...). BTW, I run egroupware on PHP5 as a CGI, I recall that somewhere on this forum a post says that egroupware runs faster on PHP4. Maybe there are other people here on this forum who can enlighten us on that point ...