Hi everyone, my laptop started to lag, especially when I turn on photoshop, mozilla and skype. It seems that it doesn't have enough memory. I work a lot in photoshop and it just wastes my time. I tried to reinstall windows 7, it works better for some time, and then it starts to lag again. Please advice me what should I do in order to improve pc performance. Maybe to change any part. My budget doesnt allow me to buy a new laptop. Laptop Specs Dell Intel Core i3, 2.10 Ghz, 4 gb RAM, windows 7 64bit