htmx.org / CEO of Customer Disposal (same)

UX latency is the most frustrating (lack of) advancement in computing over the last ~50 years. IBM, way back in the 80s, found that user productivity shot up *exponentially* as system response time dropped. The "Doherty Threshold" was defined as ~400 milliseconds; the maximum amount of tolerable UX latency before interrupting user flow state. It's unbelievable how many modern operating systems (*cough* win11) violate this threshold constantly. Literally all you need to do as a Dev is pay attention. Add a "Doherty Threshold" to your test suite. There's so many different profiling tools, and especially with how good models are, really no excuse. Sure, some stalls are unavoidable, but that's when you pull out other UX tricks to at least give the illusion of responsiveness. Crazy how much vintage computing hardware feels immeasurably more responsive despite having thousands of times less overall performance.