Despite what Casey Muratori is trying to argue (and I'm largely sympathetic to his efforts) most line-of-business software needs to optimise for changeability and correctness ("programming over time") not performance.

In investment banking (markets / trading), much of the most economically valuable software could easily run on a Raspberry Pi. I always call it "10,000 if-thens" (all the business rules that build up over 10+ years). Excel with VBA can still do a lot. A very tiny fraction of markets / trading software needs to be performant, yet, those tiny parts dominate most of the conversations (here and at work). It is tiring. Keep writing simple if-thens with a few for loops. Keep making money...