I have 5 users of both Bitdefender Total Security and Kaspersky Total Security on different machines. Bitdefender is very lite and it's cpu usage when idle is 1% or less. Computers boot up in less than 20 seconds. Kaspersky has equivalent protection and uses even less ram and cpu usage when idle is as little as .10%. Computers boot up in about 10 seconds. No windows fast startup on any machine. I'm happy with either one of them.