Boomerang: How fast do users think your site is?
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Transcript of Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
Boomerang: How fast do users think your siteis?
Philip Tellis / [email protected]
ConFoo.ca/2011 – 2011.03.09-11
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
$ finger philip
Philip [email protected]
@bluesmoongeek - paranoid - speedfreakyahoohttp://bluesmoon.info/
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
TimeThe adversaryMeasure twiceboomerang
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
TimeThe adversaryMeasure twiceboomerang
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
TimeThe adversaryMeasure twiceboomerang
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
TimeThe adversaryMeasure twiceboomerang
Only 10–20% of page load time is spent on systems we control
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
TimeThe adversaryMeasure twiceboomerang
It’s what we can’t control that users notice
http://twitter.com/stoyanstefanov/status/43747252317077504
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
TimeThe adversaryMeasure twiceboomerang
We can’t control
browsers
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
TimeThe adversaryMeasure twiceboomerang
We can’t control
plugins
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
TimeThe adversaryMeasure twiceboomerang
We can’t control
OSes
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
TimeThe adversaryMeasure twiceboomerang
We can’t control
viruses
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
TimeThe adversaryMeasure twiceboomerang
We can’t control
antiviruses
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
TimeThe adversaryMeasure twiceboomerang
We can’t control
microwaves
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
TimeThe adversaryMeasure twiceboomerang
We can’t control
baby monitors
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
TimeThe adversaryMeasure twiceboomerang
We can’t control
naughty neighbours
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
TimeThe adversaryMeasure twiceboomerang
We can’t control
file shares
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
TimeThe adversaryMeasure twiceboomerang
We can’t control
governments
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
TimeThe adversaryMeasure twiceboomerang
We can’t control
rodents
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
TimeThe adversaryMeasure twiceboomerang
We can’t control
Try simulating all that in the lab!
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
TimeThe adversaryMeasure twiceboomerang
We need to measure real end-user performance
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
TimeThe adversaryMeasure twiceboomerang
We need to measure real end-user performance from the realend-user’s perspective
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
TimeThe adversaryMeasure twiceboomerang
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
TimeThe adversaryMeasure twiceboomerang
While this might work, it isn’t necessarily representative
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
TimeThe adversaryMeasure twiceboomerang
What about JavaScript?
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
TimeThe adversaryMeasure twiceboomerang
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
TimeThe adversaryMeasure twiceboomerang
boomerang is...
A piece of javascript that you add to your web page where itmeasures and beacons back to you, the end user’s perceivedperformance of your page
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
TimeThe adversaryMeasure twiceboomerang
How?
<script src="boomerang.js" type="text/javascript"></script><script type="text/javascript">BOOMR.init({
user_ip: "<network ident>",beacon_url: "http://mysite.com/beacon.php"
});</script>
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
TimeThe adversaryMeasure twiceboomerang
What does it do?
Measures user’s network throughput and latency to yourserverMeasures the current page’s load timeBeacons these results back to your server
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
LatencyBandwidth/ThroughputLoad timeAccuracy
How does boomerang work?
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
LatencyBandwidth/ThroughputLoad timeAccuracy
Let’s take that one at a time
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
LatencyBandwidth/ThroughputLoad timeAccuracy
Measuring latency
Download a 32 byte gif 10 times in sequenceMeasure the time to download eachDiscard the first measurement because it’s overpriced9
Calculate the arithmetic mean, standard deviation andmargin of error of the rest
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
LatencyBandwidth/ThroughputLoad timeAccuracy
Measuring throughput
After the latency test is done, we download progressivelylarger imagesStop at the first image that times outRedownload that image a few more timesCalculate the median, standard deviation and margin oferror of the largest image
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
LatencyBandwidth/ThroughputLoad timeAccuracy
Measuring latency before throughput helps here
Those 10 latency images do a lot to widen the TCPwindow sizeThe bandwidth images make much better use of availablebandwidthThe image we end with makes the best use of bandwidth
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
LatencyBandwidth/ThroughputLoad timeAccuracy
How do we measure page load time?
In the onbeforeunload event, measure the time andstore it in a cookieIn the onload event, check the cookie, and measure thedifference with the current timeWe also make sure that the page that set the cookie is thereferrer of the current page
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
LatencyBandwidth/ThroughputLoad timeAccuracy
What? Two pages?
Yes, this needs two pages and cookies. If those aren’tsupported, we try to use the WebTiming API10.
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
LatencyBandwidth/ThroughputLoad timeAccuracy
How accurate is it?
Latency measurements are very accurate (±1%)Bandwidth is to an order of magnitude. For badconnections can be ±30%Page load time sometimes has outliers, you needpost-filteringThe margin of error tells you how good your data is
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
BasicIn-page timersAJAX
Include it on your page
<script src="boomerang.js" type="text/javascript"></script><script type="text/javascript">BOOMR.init({
user_ip: "<network ident>",beacon_url: "http://mysite.com/beacon.php"
});</script>
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
BasicIn-page timersAJAX
For most sites, that’s about it
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
BasicIn-page timersAJAX
You probably want to do more
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
BasicIn-page timersAJAX
Measure more than just load time
<html><head><script>var t_pagestart=new Date().getTime();</script>...<script>var th=new Date().getTime();</script></head><body>...<script>var tj=new Date().getTime();</script>... ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
BasicIn-page timersAJAX
...<script src="boomerang.js"></script>...var te=new Date().getTime();BOOMR.plugins.RT.setTimer("t_head", th-t_pagestart).
setTimer("t_body", te-th).setTimer("t_js", te-tj);
</script></body></html>
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
BasicIn-page timersAJAX
This adds the t_head, t_body and t_js fields to the beacon
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
BasicIn-page timersAJAX
Loading dynamic content
BOOMR.init({user_ip: "<network ident>",beacon_url: "http://mysite.com/beacon.php",auto_run: false
});
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
BasicIn-page timersAJAX
Loading dynamic content
// Just before download startsBOOMR.plugins.RT.startTimer("t_done");
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
BasicIn-page timersAJAX
Loading dynamic content
// Just after download finishesBOOMR.plugins.RT.done();
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
BasicIn-page timersAJAX
Much more
http://yahoo.github.com/boomerang/doc/howtos/
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
shouldacouldawoulda
The beacon
GET request to the beacon URL (response ignored)All parameters passed in the query stringExtra timers are passed in as a comma separated list int_other
before_beacon JavaScript event fired just before thebeacon is sent
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
shouldacouldawoulda
What should we do with the data?
Sanity checking to:Remove fake dataRemove abusive dataMaybe just rate limiting
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
shouldacouldawoulda
What can we do with the data?
Statistical analysis to:Remove outliersAggregate based on bandwidth blocksMeasure trends over time and correlate them with codechanges
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
shouldacouldawoulda
Bandwidth blocks
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
shouldacouldawoulda
Bandwidth blocks
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
shouldacouldawoulda
Bandwidth blocks
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
shouldacouldawoulda
Bandwidth blocks
Data points from some countries may require narrower bands
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
shouldacouldawoulda
Geographic data
Looking at latency from different geographic locations can tellyou where your next mirror should be
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
shouldacouldawoulda
ISPs
Grouping data by ISP can tell you who’s behaving badly
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
shouldacouldawoulda
More data
Write plugins to get more performance dataWe already have a DNS pluginI’ve just completed a plugin to measure IPv6 support andlatencyWhat about a full WebTiming plugin?I’m also looking at measuring connection setup time
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
shouldacouldawoulda
You decide
Once you have the data, you can do anything with it
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
Boomerang: It (almost) always comes back
http://github.com/yahoo/boomerang
http://yahoo.github.com/boomerang/doc/
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
Photo credits
flickr.com/photos/21233184@N02/4389412851http://xkcd.com/445/
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
Contact me
Philip [email protected]
@bluesmoongeek - paranoid - speedfreakyahoohttp://bluesmoon.info/slideshare.net/bluesmoonjoind.in/talk/view/2913
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
References
github.com/yahoo/boomerangMore bandwidth doesn’t matter (much) – Mike BelsheAnalysing Bandwidth & Latency – YUI BlogIt’s the latency, stupid – Stuart CheshireThe statistics of web performance
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
Overpriced images
The first image might require a DNS lookup and TCPhandshakeSlow start is not an issue since 32 bytes fit in 1 packet
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?
IntroductionHow does it work?Using boomerang
Data
WebTiming API
JavaScript interface to network timing information includingDNS, TCP connect, download, etc. Supported by:
Microsoft Internet Explorer 9Google Chrome (WebKit)W3C specification
ConFoo.ca/2011 – 2011.03.09-11 Boomerang: How fast do users think your site is?