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function debounce(func, wait, immediate) {
  var timeout;

  return function() {
    var context = this,
        args = arguments;

    var later = function() {
      timeout = null;
      if (!immediate) func.apply(context, args);
    };

    var callNow = immediate && !timeout;

    clearTimeout(timeout);

    timeout = setTimeout(later, wait);

    if (callNow) func.apply(context, args);
  };
}

var myEfficientFn = debounce(function() {
    // All the taxing stuff you do
}, 250);