You can't just ask what kind of performance, it is all relative to what you are using it for. For non-gaming things, it will be great. Without a video card in it past the Intel stuff, it can run older games decently, stuff like Half Life 2, Diablo 3 should be good also. The screen resolution is pretty bad for the rest of the specs, as well as the slow hard drive. Having mis-matched RAM sticks will hurt performance a bit.
Needed to have asked about the system before buying, not after.
It's a good general use system, but likely too much CPU, screen is not very good quality and a slow hard drive. Not a system most people would get, it's like a car with a strong engine but cheap tires and bad seats.