We are aware and fully acknowledge the performance issues. We've got a plan to sort them it just takes time as we have to undo a lot of changes made in the past. Hopefully™ there will be a performance increase and latency reduction with next update. You'll find that runs and simple objects cause negligible performance reductions, and we do try and cut back as and where we can. - but you must understand the server would be very bland for those who aren't 24/7 fighting if we didn't have a certain level of eye-candy.
As for a better box, Arma 3 being a single-threaded game we can't really get a better box for what we are doing. Ram utilisation is something like 4 out of 64GB and CPU load is usually only around 50% (would have to get someone to cross reference these numbers for me) - as evidenced by the lack of crashes and mass kicks. Any perceived FPS and connection issues are more due to the mission itself and the various objects and scripts interacting with one another than the server box not being able to perform. As I've stated above, we're working on that but it's a long and arduous task.
Scripts only affect performance when they're being run, so removing little-used scripts wouldn't actually increase your performance. I think you mean scripts which aren't needed, which is exactly what we're doing. That's part of trying to improve our framework; it is a matter of reviewing many of our hundreds of custom and default functions to ensure that they're running in the best way with regards to server performance. As I stated in the Development update, we're moving to a much more player - headless-client - database related version of the fundamental scripts to the server. For example virtual inventories and virtual housing. The reason this improves performance on a player and network level is that information isn't being broadcast to all members, it is being sent to the headless client (a way of virtual multi-threading) and to the database. As such, the information will only be broadcast to players who request it, rather than players' information being broadcast so it can be requested.
Thanks for being reasonable in your post, rather than SHIT SERVER FIX FPS. Hopefully I've answered your concerns.