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"For the surgical team, it was a challenge to manage all of the emergency cases between the two operating theatres," he said.
We replace setTimeout, setInterval, requestAnimationFrame, Date, Date.now(), and performance.now(). In practice, this covers the major JavaScript timing primitives most animation code relies on. The page thinks time is passing normally. In reality, time advances by exactly 1000/fps milliseconds per frame, and only when we tell it to.