Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Beware serious performance problems

This game could have been tremendous! I really loved the demo and it played OK for the first few levels. However, it quickly turned into a problem and performance made the game play very slow and then crash out completely. I am a computer professional and have a pretty good machine. I worked for weeks trying to get it to run right and found that for some people, the game runs fine but others have a nightmare experience for which there is no resolution. If you're one of the lucky ones this could be a great game. For me - it was disaster. The company is no help. The forums provided no answers that worked.