From EA/DICE about the 1.5 patch :
Destroyer MG lag - this only seems to happen if the player driving the destroyer is in 3rd person camera and a 2nd player climbs the ladder to the machinegun. The subsequent framerate hit could be felt by all players on the server.
FH ships are FULL of ladders !!! AND a lot of ship commanders use external view once every few minutes to check what happens behind them. ( i do this in tanks too )
So if the ship commander is in 3rd person view, checking his rear while a lot of players on board are using the ladders ( to get to the planes ) = laaaaaaaaaag !!!!
its more like dice was not able to fix the material - lod bug, thats the reason why it lags, mainly
How about you use like a wheelchair lift or something instead, it's too hard to climb the ladderds while the ship is moveing anyway
how about not making people slide around the fucken ship when there walking on it this pisses me off so much