I didn't write this, but this is how we detect when the event loop is
getting blocked.

var lastLoop = Date.now();
function monitorEventLoop() {
        var time = Date.now();
        if (time - lastLoop > 1000) console.error('Event loop blocked ' +
(time - lastLoop));
        lastLoop = time;
        setTimeout(monitorEventLoop, 200);
}
monitorEventLoop();

When it's blocked, we can check the logs to see what was getting
called that may be the culprit. It hasn't been hard to figure out from
there.

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