problem about function anyone help Me

[u8210618]

now i will use zimbra 6.08 GA opensource version on redhae x64
my problem is
1. i want to know ajex web page for zimbra is slow anyone help to speedup
now my client is use Cpu 3.0 pentium4 ram 512
2. distribution function when i use i config a@test.com for group user i will test it i config three user in this distribution when i send mail to a@test.com i think
in threee user will receive but when he or she reply it i don't understand it can reply to me or to three people on distribution list on a@test.com
3. in distribution when i send it my request is can i see all of list email on a@test.com in To or cc in list to check will i send correct name on distribution
4. in function calendar i will set about appointment to use about room or location
can i send message with comfirm or auto decribt for mail when it send