To be fair, performance is usually part of the “does it work in real life” question, it’s just that doing sensible things is probably good enough. The crud app

To be fair, performance is usually part of the “does it work in real life” question, it’s just that doing sensible things is probably good enough. The crud app at your startup probably doesn’t need to worry about cutting optimizing every last millisecond off of page load or scaling across some k8s cluster or whatever. But I’ve stopped using (or never seriously tried) otherwise good services because of flow-stopping performance problems i.e. multi-second page loads, stuttering pages, battery drain, etc.