I also play on a fairly good spec laptop, it's a few years old but it was top spec at the time - a desktop Xeon processor, 4GB RAM, Windows 7 32-bit and a decent Nvidia mobile graphics card. My performance is intermittent, sometimes really good, but with frequent and severe spikes of 2FPS for a minute or so. I don't know what it is that triggers the severe performance problems. I have a fair amount of RedPower in my base including a few sorting machines and relays, three 36HP boilers, a Steve's Carts tree farm, and a bank of Router-filled furnaces feeding charcoal into a bank of generators.