I'll do an optimisation pass when I'm allowed to update the workshop entry again.
What are your specs though?

i7 6700K, RX460, 32GB Ram

I think it's the server that gets the performance problems. The clients don't see the fps drops (unless they of course are the server as well).
So when I create a lobby with my friend and we play that map, I get the fps drops whenever he enters the bomb area, regardless where I am. He doesn't see fps drops.

Thanks for the extra info. Since you're hosting and playing, that's not an ideal situation obviously, but I'll keep it in mind anyway during further optimisation.

норм карта

Btw: you can safely drop on a truck, that transports you to the end of the tunnel. It's hard to get out of there because incoming trucks kind of have a wave in front of them that pushes you back.

Please just make it so you die if you drop down :)

Aware of this, thanks :) Will fix this, among other bugs/issues.