Rum for Breakfast
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RUM for Breakfast
Buddy Brewer, Carlos Bueno, Philip Tellis
Velocity 2012 / 2012-06-26
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https://github.com/lognormal/boomerang/
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Buddy built the navtiming plugin
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tl;dr
1 Measure a bunch of stuff in the browser2 Use high school stats that we vaguely remember3 Randomly invent insights
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Log-Normal Distribution
The logarithm of the x-axis follows a Normal distribution
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Log-Normal Distribution
Use the Geometric Mean for pure Log-Normal distributions
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Log-Normal Distribution
Performance data does not always follow a "pure" Log-Normal
distribution
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Look at the entire spread
. . .
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Look at the entire spread
which often approaches an infinite width
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• 0.8% of hits are fake/abusive• 0.2-0.5% of hits are from a stale cache• 0.1% of hits are absurd• Timestamps in the future (or past depending on how you
interpret it)• Bots ignore robots.txt across domains• "Interesting" caches/copies
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Even with beacons, you need to sanitize your input
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Band-pass filtering
• Strip everything outside a reasonable range• Bandwidth range: 4kbps - 4Gbps• Page load time: 0ms - 600s
• You may need to relook at the ranges all the time
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IQR filtering
Derive the range from the data
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MoE & Sample size
There is an inverse square root correlation between sample size
and margin of error
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How big a sample is representative?
Select n such that���1.96 σ√n
��� ≤ 5%µ
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This needs to be at your lowest drilldown level
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How does performance impact human behavior?
8 million pages
1.5 million visits
50 different dimensions
0%
17.50%
35.00%
52.50%
70.00%
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30
very fast sessions had high bounce rates
0%
17.50%
35.00%
52.50%
70.00%
1 3 5 7 9 11 13 15 17 19 21 23 25 27 29
bounce rate vs. load time
0%
17.50%
35.00%
52.50%
70.00%
1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5 10 10.5 11 11.5 12 12.5
bounce rate vs. DOM interactive
0%
20.00%
40.00%
60.00%
80.00%
0.5 2 3.5 5 6.5 8 9.5 11 12.5 14 15.5 17 18.5 20 21.5 23 24.5 26 27.5 29
bounce rate vs. front end time
http://www.flickr.com/photos/21560098@N06/3796822070
is my web site performance toxic to my users?
http://www.flickr.com/photos/thecosmopolitan/6117530924
LD50 - when do half the users bounce?
Back end time
DOM Loading
DOM Interactive
Front end time
DOM Complete
Load event
1.7 sec
1.8 sec
2.75 sec
3.5 sec
4.75 sec
5.5 sec
Bounce rate >=50%
What is the LD50 for your site?
Other bounce rates? 40%? 30%?
Other variables? (critical content visible, etc)
Other behaviors? Conversions, revenue, pages per session, actions, when do people make tea?
Future directions
Questions?
Buddy Brewer @bbrewerPhilip Tellis @bluesmoon
Carlos Bueno @archivd
Photo credits
• Rum on Ice – wiserbailey on flickr
• Laptop-top Cat – wabisabi2015 on flickr
• About NCSA Mosaic – ncsa
• Distilled – Lost Albatross on flickr
• Anthon Berg Chocolates – ulterior epicure on flickr
• KilroySchematic – on WikiPedia
• Boxplot vs PDF – on WikiPedia
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