3 Commando Brigade

FPS drops with weapon addons

Check out this post from Reddit, its very useful for you guys making missions as to get an idea of what kind of weapons best to use that wont cause a serious frame drop from too high poly count.

https://www.reddit.com/r/arma/comments/3c364a/i_did_some_analysis_of_modded_weapons_impact_on/

Don't forget the Disclaimer though that he points out, he only tested this in Singleplayer and does not what effect this might has in Multiplayer although it could be exactly the same.  Somebody will probably find that out sooner or later I guess.