> "This code is ok if you don't care at all about performance, but in a VR or AR app you can quickly add milliseconds frame time and make yourself sick writing relatively simple code in this style."

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This point needs to be made more often. It's fine to neglect performance when you're writing a CRUD web app, or a non-critical mobile app - the worst that will happen is the user will get annoyed. But in a VR environment dropping frames can make people physically sick.