Yes by not loading unncessary modules you can save memory and increase performance.
It will be very hard for me to tell you which ones you don't need, since I wouldn't know exactly what features you need on your webserver. You should go through the manual, and see what each one of them does then decide whether to keep them or not.
For these 2 you've mentioned I can give you a little explanation:
If you don't know what WebDAV is then you don't need mod_dav and mod_davfs. It's sorta like FTP where you can do file operations such as copy, delete, move etc except that it uses HTTP(you'll need a proper client for it).
mod_imap(btw has nothing to do with the mail protocol) enables server-side imagemaps, again if you don't know what they are then you probably don't need it.
Last edited by Demonbane; 10-16-2004 at 03:15 AM.