WotLK Game freezes for couple seconds

[bachvarov9494]

Hello.
Used to play on mobile network (hotspot) there i had no ussues at all. Once i change to wifi(modem) i started having some weird lagging more like freezing event al low ms(40) I have checked my connection, bought a new router and everything seems to be fine with my network. Please someone give me some addvices

Ps I have tried with no addons at all doesnt work