Thank you! I deleted the weapons (weaponholders) in the water in every 40 seconds. I hope it will solve the problem. Unfortunately (or fortunately) I cannot test it, because there is no LAG in my PC with destroyed boats and proxies and weaponholders.... but betatesters feedbacked the lag and I try to improve the mission. I hope, now it's well.
@Trapper: I know what do you say, but I tried to keep low level the script frequency... So my scripts run relatively rare. There are 3 script: 1 generate RACS, other generate SLA and 3rd remove the bodies, delete the boats/proxies and weaponholders... and all script run different frequency (60-40sec... etc) and in every script I left time for the game with many ~1