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You can create a lot of profit for your employer whilst contributing nothing to society or even be detrimental to it. Money has no bearing on that.

They can take the skill to any other employer and improve performance for others elsewhere. Think of all the seconds you could get back to do more meaningful things if more websites were fully optimized. It may sound silly but it snowballs into minutes, hours, and days.

I think most jobs contribute positively to the society. Not much, for sure, but they contribute.

Is the cleaner regularly removing poop stains from the personal toilet of a big and rich Google shareholder more useful than the qualified Google engineer working hard so a big number is very slightly bigger on one the shareholder’s list of numbers? I think the cleaner has more impact.

Yeah this is no different from someone optimizing literally any other performance bottlenecks in ANY other web project.

Yea, and the scale of impact on the economy of those micro seconds is probably huge