Last week I spent some extra time on a ticket in order to write a slight refactor that saves some RAM. If I had asked my boss for an extra day to implement this I would have been chastised for not delivering faster.

Thankfully my colleagues saw the value in what I was doing. I smuggled the optimization into my PR with their approval. Anecdotal, but there are still people who care about efficiency out there.

That being said, unless your manager is John Carmack, or you work in embedded systems, time spent on reducing memory footprints is seen as wasteful by the business.