1) Check your Computer's Hardware Specifications:
Lack of CPU power is a prime factor of lag in online gaming and when playing unblocked games at school. Check for your system's performance. Make sure that your computer is fully compatible with all the latest games, and it is completely up to date with the latest tools and technologies
2) Check your Internet Connection:
3) Free up Your Computer's RAM:
This will enable your computer to fully concentrate in processing the game, which will eventually make your online gaming experience a more fulfilling one.
4) Defragmentate your Hard Disks
6) Operating System:
Your operating system must be compatible with the requirements of the game. Furthermore, it should be free of any type of viruses, malware and Trojans, etc.
7) Downloading:
Any type of downloading or uploading should be stopped, when playing online