Deconstructing Performance

A presentation at From the Front - The Frontend Guide to Life, the Universe and Everything in September 2016 in Bologna, Metropolitan City of Bologna, Italy by Denys Mishunov

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DENYS MISHUNOV • DIGITAL GARDEN AS • @MISHUNOV

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How long is FOREVER? - Sometimes just 1 SECOND

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2001

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2016

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2001

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2016

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2003

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2016

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2446 kB AVERAGE BYTES PER PAGE 93,7 kB 2003 2005 2007 http://goo.gl/qjmum 2009 2011 2013 2015

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LOADING TIME 2446 kB EVOLUTION 8s 4s 1999 2006 http://goo.gl/qjmum 2s 2012 1s 2016

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1s 2% conversio㎱ 0.1 s 1% revenue

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“WEB STRESS” Foviance, 2010

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“WEB STRESS” Foviance, 2010 CONCENTRATE UP TO + 50% http://goo.gl/kjTQZR

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“MOBILE WEB STRESS” Radware, 2013

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“MOBILE WEB STRESS” Radware, 2013 PEAK FRUSTRATION UP TO + 26% http://goo.gl/WPb3GU

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“MOBILE WEB STRESS” Radware, 2013 ENGAGEMENT UP TO

8% http://goo.gl/WPb3GU

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MOBILE TRANSACTIONS SURVEY Harris Interactive for Tealeaf, 2011

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MOBILE TRANSACTIONS SURVEY 23% CURSED at their device

! % @

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MOBILE TRANSACTIONS SURVEY 11% SCREAMED at their device

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MOBILE TRANSACTIONS SURVEY 4% THREW their device

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PEOPLE HATE WAITING

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19.913s http://goo.gl/JnXZ2x 19.000s 22.213s

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106.8 million views 19.913s 19.000s http://goo.gl/JnXZ2x 22.213s

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PERF RMANCE is not MATHEMATICS

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PERF RMANCE is PERCEPTION

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“ The real thing we are after is to create a user experience that people love and they feel is fast... and so we might be frontend engineers, we might be dev, we might be ops, but what we really are is perception brokers. Steve Souders, “High Performance Web Sites” ”

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WEBER-FECHNER LAW JND (just noticeable difference)

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20% RULE EVENT

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20% RULE EVENT 20%

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NOTICEABLE = != MEANINGFUL

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OPTION 1 OPTION 2

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OPTION 1 OPTION 2 1.6с 2.0с

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20% RULE REGRESSION ALLOWANCE EVENT

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20% RULE REGRESSION ALLOWANCE EVENT +20%

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“ TIME persists merely as a consequence of the EVENTS taking place in [space]. Martin Heidegger ”

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ACTIVE PASSIVE Boy, am I busy 36%

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ACTIVE Boy, am I busy PASSIVE

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PREEMPTIVE START ПРОЦЕСС EVENT EVENT ACTIVE PHASE EVENT

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PRELOAD TOP HITS mobile Safari Settings / Safari / Preload Top Hits

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RESOURCE HINTS <link rel=“…" href=“…"> https://www.w3.org/TR/2016/WD-resource-hints-20160225/

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rel=“dns-prefetch” rel=“preconnect” rel=“prefetch” rel=“prerender” rel=“preload” as=“TYPE” http://goo.gl/Kk3qJD

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EARLY COMPLETION ПРОЦЕСС EVENT EVENT EVENT ACTIVE PHASE

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PASSIVE PHASE

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PASSIVE PHASE

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ACTIVE SMASHING BIRTHDAY! PHASE

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OPTIMISTIC UI

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OLD DAYS CLICK ME

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OLD DAYS CLICK ME API

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NOT-OPTIMISTIC UI ✔ API

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NOT-SO-OLD DAYS CLICK ME

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NOT-SO-OLD DAYS API

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NOT-SO-OPTIMISTIC UI ✔ API

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OPTIMISTIC UI

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OPTIMISTIC UI CLICK ME

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OPTIMISTIC UI ✔ API

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OPTIMISTIC UI r o r r e OH ✔ MY… API

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CRITICAL PATH

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CRITICAL PATH CSS IMG JS HTML IMG JS JS IMG CSS JS CONTENT

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CRITICAL PATH HTML CONTENT IMG CSS JS IMG JS CSS IMG JS

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goo.gl/JnXZ2x

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goo.gl/JnXZ2x PASSIVE PHASE ACTIVE PHASE

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“ The perception of performance is just as effective as actual performance ㏌ many cases ”

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How long is FOREVER? -…

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THANK YOU DENYS MISHUNOV • DIGITAL GARDEN AS TWITTER: @MISHUNOV DRAWINGS: DENYS MISHUNOV a.k.a “ME”