JavaScript Javascript countdown is going slow?

For a mostly-accurate countdown, use setTimeout().

setTimeout(fn, 7e3);

If you absolutely must have it as close to 7 seconds as possible, use a tight poll (requestAnimationFrame()) and look at difference between the time of start and current poll.

var startTime = Date.now();
requestAnimationFrame(function me() { 
     var deltaTime = Date.now() - startTime;
     if (deltaTime >= 7e3) {
         fn();
     } else {
         requestAnimationFrame(me);
     }
});

Poly-fill as required.

Answer:1
  1. the most precise way to run something after 7 seconds - is to use setTimeout with 7000 ms interval
  2. a. there is no browser that guarantees an interval to run with 1ms resolution. In the best case it would be 7-10ms
  3. b. there is only one thread in js, so the tasks are queued. It means that the next run will be scheduled to only after the current run is finished.

Some useful reading: http://ejohn.org/blog/how-javascript-timers-work/

Answer:2

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