Outgoing Bandwidth Limitation

Where exactly do you want this? Physical node, CT or VM? The short answer is that proxmox doesn't have a builtin options for that in the interface. Just use any traffic shaping script for tc for that.
 
Thanks for your help.

You mean about IPtables right ???

Limit outgoing on note will limit all traffic of all VPSes right ??
I want to limit outgoing bandwidth all VPSes at 5MB/s only.