How fast is my site? integrate boomerang and google analytics

measurePageloadTimes.js

<script type="text/javascript">
    BOOMR.init({
        beacon_url: "/boomerang.gif",
        BW: {
            enabled: false
        }
    });

    BOOMR.subscribe('before_beacon', trackInAnalytics);
    var pageType = "homepage"; // customize this 
    var pageTitle = "Measuring pageSpeed in GA"; // customize this
    function trackInAnalytics(beacon) {
        try {
            if (!beacon.t_done || beacon.t_done < 0) return;
            var timeTaken = beacon.t_done;
            _gaq.push(['_trackEvent', pageType + 'PageLoad', getBucket(timeTaken), pageTitle, timeTaken]);
        } catch (e) {}
    }

    function getBucket(timeTaken) {
        var bucketString;
        var bucket = [1000, 1500, 2000, 2500, 3000, 3500, 4000, 4500, 5000, 5500, 6000, 6500, 7000, 7500, 8000, 9000, 10000, 15000, 20000, 30000, 45000, 60000];
        for (var b = 0; b < bucket.length; b++) {
            if (timeTaken < bucket[b]) {
                bucketString = '< ' + bucket[b] / 1000 + 's';
                break;
            }
        }
        if (!bucketString) bucketString = '> ' + bucket[bucket.length - 1] / 1000 + 's';
        return bucketString;
    }
</script>

What does this code do? http://blog.tmahesh.com/2011/02/how-fast-is-my-site.html

Two things to note:

1. If you're using the updated Google Analytics, you may want to replace the code
   _gaq.push(['_trackEvent', pageType + 'PageLoad', getBucket(timeTaken), pageTitle, timeTaken]);
   with
   ga("send", "event", pageType+"PageLoad", getBucket(timeTaken), pageTitle, timeTaken)

Also, make sure to include rt.js rather than bw.js because bw.js doesn't trigger the beacon for some weird reason.
Took me about two hours to play around and debug to get this working.

... and after a little testing I noticed that bounce rate immediately went to 0% after sending these events .. NOT what I wanted!

If you send the event (using either the old ga.js or the new universal analytics), you'll notice that the bounce rate immediately goes close to 0%. Meaning that both _gaq.push and ga("send", "event" ...) will kill the bounce rate measurement.

I didn't want to kill the bounce rate, I wanted to measure it (and other metrics) against the load time to get a baseline, then improve the load time and measure the effects.

Fortunately, you can instruct the event to NOT affect the bounce rate, as mentioned here: http://www.lunametrics.com/blog/2014/05/06/noninteraction-events-google-analytics/

Here is an updated version of the ga send and gaq push that will make sure GA won't change the bounce effects:
_gaq.push(['_trackEvent', pageType + 'PageLoad', getBucket(timeTaken), pageTitle, timeTaken], true);
ga("send", "event", pageType+"PageLoad", getBucket(timeTaken), pageTitle, timeTaken, {'nonInteraction': 1})

Hope this helps y'all :)