Because early Windows OS (especially before Windows 7) exists inherent defects on RAM management mechanism. As a result, it's quite common to slow down after running for some time or several large programs. Especially when many programs are running at the same time, which often leads to the RAM exhaustion and Windows crash.

IObit Game Booster is an acclaimed old brand PC gaming speedup utility. Its working principle is making powerful optimization to your system automatically when you are playing games, so as to make games run more smoothly, and bring you more excellent gaming experience!