Guild Wars 2

as topic title, i live in a residence and we have a sort of shared connection and NAT is closed. game is smooth in pve, but when it comes to wvw (don’t know about spvp yet) and specifically to significant battles (40-50+ players) i have serious lag issues (from 35 fps i drop to 1-8 even on low settings).
i was wondering if that matters and if there are any solutions, apart from, well, opening it since it’s not a personal choice.

That won’t matter no, opening the NAT won’t change anything. Your graphical performance has nothing to do with your network performance/settings. You’re just experiencing what most players without a recent and fairly high-end CPU experience in WvW zergs/large groups.

still i lag only when there are several palyers from other realms

Either way, networking problems/settings won’t affect your graphical performance to any noticeable degree, if at all. Your performance issues are most likely related to your actual hardware struggling, and is common in this game in the case of WvW and large groups.

It has nothing to do with other players from other realms because at the end of the day you are playing on the same instance on the same server, even if those players belong to a different world.

As Pandem said, this is not network lag, but actually graphical lag due to hardware.

See Part 4 of this thread to understand more in-depth of why it is so.