I have had several problems with the V8 GC and large heap size over the 
past two years.

If you want to track pause times roughly and in general (not necessarily 
GC), this will help:

var time = Date.now();
setInterval(
  function() {
    var now = Date.now();
    var delta = now - time - 50;
    if (delta > 10) {
      var message = 'Event loop blocked for ' + delta + 'ms.';
      if (delta > 1000) {
        console.error(message);
      } else {
        console.log(message);
      }
    }
    time = now;
  },
  50
);

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