I don't know about you, but I'm rarely annoyed that my server isn't 5% faster. But I'm always annoyed when it goes down.

No, you're wrong. An OS that is just tuned for performance cant devops the blockchain like IBM's AI can using serverless IOT devices.

Stability and reliability are also nice.

Arguably, performance v. efficiency is a fair decision. In most cases it means the same thing but in a few cases it really doesn't.

weird way to spell security

who needs performance, current hardware is too fast for non-server meanwhile cruds can be optimized anyway

Absolutely not. Mobile operating systems (including those for laptops) should be tuned for maximising battery life.

Or provide profiles for different power situations.

Right. This way the ransomware can encrypt the hard disk really quickly. And decrypt when you pay the ransom. ;-)

Security, folks. A fast car without seatbelts is a death trap, not a means of transportation.

High performance unauthenticated remote code execution