I had lag in one round, in a later round on Omaha with slightly (~15) players less, I was lagfree and that was after a server restart. The one round on the full 128p server my fps went down to 10-15 in some areas or when looking in specific directions.
But I'M playing on a laptop anyway, I never have good fps. There is just bad and worse. This one round was only hardly playable :/