Well, i work in a AAA game engine that needs to run on consoles, so... :-P
(though i work mostly on tools nowadays but even then, optimization is important - from my experience people wont tell you that the tool is slow, but they'll really like it if you make it faster, which is why i always dismiss comments like "people like Electron/otherslowstuff, otherwise they wouldn't use it" as way more often than not, people wont tell you about something being slow and they'd rather get used to it, unless it REALLY affects them in a major way)
Sorry, when I said "you" I meant the average "HN you", who tend to have 4 abstraction layers and 5 third-party frameworks between their users and the metal :)
(though i work mostly on tools nowadays but even then, optimization is important - from my experience people wont tell you that the tool is slow, but they'll really like it if you make it faster, which is why i always dismiss comments like "people like Electron/otherslowstuff, otherwise they wouldn't use it" as way more often than not, people wont tell you about something being slow and they'd rather get used to it, unless it REALLY affects them in a major way)