EAC's high CPU usage

Hi, I’m not a dev, I just want to know why Easy Anti-cheat use so much CPU resources while I play Fortnite or any game that use EAC, Fortnite asks for a 2 core 4 thread CPU as recommended requirement! I’m not talking about minimum requirement but the recommended one!
How is this make any sense?
It’s utilize up to 30% of my i5 3570!