A good reference for this is to check out one of the EUTW servers (use filter in server browser.)

There is usually one of them at full capacity starting from late afternoon (GMT+1).

You can observe lagging voip in the following channels:

• Lobby
• Global channel
• Command channel
• Side channel

It will work fine for:

• Group channel
• Vehicle channel
• Direct communication

Please try to fix this for the next patch. As mentioned by lot of people, this kills teamplay on multiplayer servers.

The Vermin has now been taken care of:

Fixed: Vermin has a magazine with red tracers at the end by default, added tracer magazines for all colors (http://feedback.arma3.com/view.php?id=21399)

Please expand this to the other weapons by adding respective yellow, red and green variants. (i.e. for the new DLC MMGs)