lags in GOH

[zetter]

hello

we'r playing goh 1.35 duo and having rly terrible lags when it comes to killing main quest boss, it requires a questline which takes a couple of hours to do
just after loading its no lags
after 1-1.5 hours lags appears especially at the moments of some skills using
fix it someone plz if it possible

p.s.: i'm completely noob to jass and coding so asking any willing volunteers