I'm running some simulations from home, but I need more speed. I was wondering how to best spend my money. I'm using Open source Fortran on a Mac which is about six years old. If I buy the Intel Fortran compiler for about $600, that might increase my speed by a factor of 2 or more. Alternatively, I could invest in a new computer. If I buy a PC then I might get more computational bang for my buck. We have occasional brief power outages here in Oregon, so I was thinking a laptop has a battery and might get me through many of these outages, but do laptops provide as much computational speed per dollar spent. Does anyone have advise?