Spartan Ops is laggy...

Hello guys,
I have a big problem with Spartan Ops.
If I play with random Spartans(matchmaking) it is -Yoink- laggy and I dont know why…
But if I play with some friends there are 0 lags.

Could it be that only amercians/canadians get the host(I live in Europe)?

Yes, I have the same experience I join a random game just to feel so much lag. But I still join them anyways I just hope there is a serveru pdate for that.