Razer Game Booster is a PC optimisation tool which uses several techniques to try and improve your gaming performance.
The program can apply a range of Windows tweaks, for example, without you having to go poking around in the Registry. We're not sure how useful most of these will be, but you can try them in a couple of clicks, and restore them just as easily later, so they're perhaps worth a try.
Game Booster includes a simple defrag tool which optimises only the game or folder you specify, hopefully improving speeds without the need to defrag your entire drive.
A "Drivers" tab highlights key gaming drivers - audio, graphics - and offers to help you upgrade them.
And the core "Boost" function tries to identify unnecessary background processes, then close them on demand, freeing up valuable system resources for your games (or any other heavy-duty programs you might be using).
All this is presented in a bizarrely dark interface, where some elements are so greyed out that you might miss them entirely. A distinct lack of help may also leave you confused. And if your PC is reasonably well optimised already, the program is unlikely to make any noticeable difference to your gaming speeds.
Still, Game Booster is free, so if you're desperate for a little extra PC performance then there's no harm in giving it a try.
Game Booster provides tools to free up a few system resources. This may not make much difference - it all depends on how well your system is optimised at the moment - but as the program is free, it's (just about) worth a try.