Hello. I am new to parallels 13, I needed it to run the windows version of office for classes I'm taking. I installed it on my macbook pro and it seems to work fine. I installed on my brand new iMac (which has a lot more horsepower) and it lags significantly. The web browsers are practically useless, no videos will play. I've been on this forum and tried to make the different configuration modifications that are suggested but nothing works. What am I missing here?