Yet Another Topic About Process/memory Management

Yet another topic about process/memory management : )

I have a 256 RAM VPS and I need to free up more memory, Im using cpanel and when i use the "top" command, those are the major memory consumers!

PS.: I removed some of the list cause I know i really need them

21635 root 16 0 20888 10m 1316 S 0 1.0 0:01.73 cpsrvd-ssl
13983 root 20 0 14644 8780 348 S 0 0.8 0:00.00 cpdavd
13994 root 34 19 9956 7376 1876 S 0 0.7 0:01.04 cpanellogd
3835 root 15 0 6592 5028 1192 S 0 0.5 0:00.01 chkservd
26595 root 17 0 6652 5020 2816 S 0 0.5 0:00.18 authProg
13911 mailnull 16 0 7664 4972 1544 S 0 0.5 0:00.14 eximstats
13993 root 15 0 6228 4436 1112 S 0 0.4 0:00.03 cpbandwd
13764 root 16 0 3524 1496 628 S 0 0.1 0:00.35 antirelayd
13692 mailnull 16 0 7404 1204 808 S 0 0.1 0:00.22 exim
13698 mailnull 20 0 7404 1144 756 S 0 0.1 0:00.00 exim
18140 mailnull 20 0 7404 1140 752 S 0 0.1 0:00.00 exim

So, my basic question is, which of them I don´t need? SOme of them I know what is it but still have some questions...

1-cpsrvd-ssl , i know this means someone(me) is connected to cpanel, but even if I log out the process stills there, is that normal ?

2-authProg , sometimes there are a lot of those process running, what is that? is that normal ?

3-exim, 3 process running, is that normal ? exim is better than sendmail ?

4-After those questions, which process am I able to drop(and how?) - I only need email forwarding(that is already working), smtp, mysql(already working too), and tomcat server.