I really enjoy getting the most out of a computer/mobile device that I have. I love trying out different OSes, messing with a video game to squeeze as much as performance possible etc.
I feel like this is a lost art that was huge in the late 90's. Everyone wanted to see how many fps they could get out of their toaster. Now, it's not just the users but even the developers don't care about optimization anymore.
I partly blame the manufacturers for this. With the turbo boost, CPUs and GPUs basically came pre-overclocked out of the box. You'll just put a beefy cooler so that the turbo boost can be maintained indefinitely.
I still remember when I fried my dad's CPU because I read a guide in a magazine on how to overclock a CPU.