Overheating

From Hack Wars Wiki

If one of your ports is attacking and begins to take damage, you will find that the CPU cost required to run it begins to rise. If your CPU load ever goes over 100%, your computer will overheat, and all attacks will stop. When your computer is in an overheated state, you will not be able to use programs or start new attacks until your computer stops being overheated. Your computer will no longer be overheated after 90 seconds or when your CPU Load drops below 100% again. Whichever comes last.

You can also use overheating offensively to disable the firewalls on your opponents computer. If you can determine which port you are being attacked from and the IP address of your attacker you can counter-attack and overheat their computer.