Just make sure all background programmes are closed and delete all files/ uninstall programmes that you don´t need. There are many Boosters like "GameBooster" or other Tuning programmes.
In my opinion those programmes don´t help much.
I always:
-Uninstall softwares, that are not necessary
-Clean the registry with any programme (For example: Registry Cleaner)
-Defragment my PC ( I suggest "Disk Defrag")
-Close all background programmes (Also Antivirus if I don´t use a hack)
-Clean my PC ( Programmes, like "CCleaner")
It also depends on your RAM