• Thanks, that'd be great.

    Glad it's fixed now - it was remarkably strange behaviour.

    Are you sure your code wasn't something nearer:

    var x=false;
    setInterval(function() {
    }, 20);

    In this case, you might expect it to take a few seconds before the lights blink at the right frequency. The internal hardware oscillator takes a few seconds before the frequency stabilises, but your code starts running before that point, so unless you delay, the initial timings can be off by quite a bit.


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