Game Fire is a small tool that aims to optimise your PC for performance.
The program can apply several different tweaks to make this happen. It's able to turn off Windows Aero, for instance, and disable CPU-intensive visual effects. It can temporarily disable background processes like the Windows Search indexer, or Windows Defender. If you normally run on a "balanced" power plan then Game Fire can temporarily switch you to "High Performance", while other options defragment memory, files, or apply various system tweaks.
While this sounds like it might be complicated, it really isn't. Essentially you just need to set up a "gaming profile", which tells Game Fire exactly which of these options you'd like to employ, and then it's able to apply all your chosen settings at a click.
How much these will actually help is another matter. A close inspection of Game Fire's tweaks, for example, shows they're basic in the extreme, and include one or two that are almost entirely useless, which isn't too encouraging. And having the program run in the background will use more than 50MB of RAM in itself, which is going to eat into whatever savings you might make.
Still, Game Fire does perform some genuinely useful functions, and can be configured to tweak your system further with just a little work. And, of course, it is free - so give the program a try, see if it works for you.