That is a bug occuring randomly, unnafected by any player actions, and it is untied to a place in the Chernarus map.
I suppose it is server internal because it hapens to me and my friend both at the same time and presumably to all other players as well.
The known fix is alt+f4 the game and relog back into the server. On two occasions we couldnt stop the lag/stutter(upon logging we were experiencing the same lag and delayed black screen before spawning) and we had to log onto another server.

In case we decide to stay inside the server, the lag/stutter persists until server restart I suppose. Uppon commiting player action we hear the sound as it would be without lag, but the animation is rendered completely after 5-6 seconds.

Servers occured on: Blue Waffles number one and two,
(NOBB)All welcome high loot server restart
TheGentsOfNovo and a couple of others.