This. I really feel optimization across this dimension perhaps the most. I just enjoy things much more. Maybe if you really want to quantify it you could think

This. I really feel optimization across this dimension perhaps the most. I just enjoy things much more. Maybe if you really want to quantify it you could think of the happiness factor as a multiplier. So you have a task that takes X time. What's say optimizing it is a net loss time-wise because it doesn't in aggregate save you more than you spent to perform the optimization. Say after optimization it only costs 0.8X time but it took 0.2X time to do the optimization so all benefit cancels out. But the difference being now happiness is 1.5 multiplier so you feel 50% better and the same aggregate amount of time is spent but it's much more enjoyable and therefore more valuable to you. Maybe I'm not explaining it well, but I totally feel this way about plenty of stuff.