The most convenient tool for working with Windows services. Batch disable and enable depending on what you use and what you don't. Fewer services running = more free resources available for use by other programs or games.
Smart disabling of services works in the PRO version of the program, but you can do a lot with the free service management tool. All services, even antivirus, are at your complete disposal. You can block any of hundreds of services and recommendations from the author will help you figure out what's what. You will see which services can be disabled and which cannot. You will also find out which services are responsible for what. For example, if you do not use Bluetooth devices, you will be able to disable several services that are associated with them.
But be careful with the descriptions and best of all, have a backup just in case. If you disable something wrong, Windows may not start. This is another reason to use the PRO version and Smart Disabling Services - in this mode the risk is minimal.