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ONCE MORE, WITH FEELING https://flic.kr/p/cxeNPs Tim Kadlec | @tkadlec | #fronttrends
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PERCEPTION IS REALITY
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PERCEPTION FRAMES REALITY
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A B
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http://livingwithlag.com/
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100ms 1% REVENUE
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100ms 1000ms Feels instantaneous & maintains a connection between action & reaction. Anything longer and the user loses focus on their task.
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DNS Lookup TCP Connection SSL Negotiation Request
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DNS Lookup 100ms TCP Connection 100ms SSL Negotiation 100-200ms Request 100ms
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DNS Lookup 100ms TCP Connection 100ms SSL Negotiation 100-200ms Request 100ms 400-500ms
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“THE FASTEST REQUEST IS NO REQUEST” —EVERY PERFORMANCE ADVOCATE EVER
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EVERYTHING SHOULD HAVE VALUE, BECAUSE EVERYTHING HAS A COST
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HOW DO WE BALANCE RICHNESS WITH SPEED
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“PERFORMANCE IS THE DEVELOPER’S RESPONSIBILITY”
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PERFORMANCE IS ABOUT THE USER
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PASSIVE ACTIVE VS
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PASSIVE
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PASSIVE WAITING OVERESTIMATED BY 36%
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DNS Lookup TCP Connection SSL Negotiation Request
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header('Link: ; rel=preload; as=stylesheet');
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function preload(url) { var hint = document.createElement("link"); hint.rel = "preload"; hint.href = url; document.head.appendChild(hint); }
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dns-prefetch preconnect prerender preload
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DNS Lookup TCP Connection SSL Negotiation Request
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DNS Lookup TCP Connection SSL Negotiation Request
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DNS Lookup TCP Connection SSL Negotiation Request
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DNS Lookup TCP Connection SSL Negotiation Request
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Network
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HTML Network CSS Javascript
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HTML Network CSS Javascript DOM CSSOM
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HTML Network CSS Javascript DOM CSSOM
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document.write(“No sleep til’ Brooklyn.”); document.getElementById(‘#main').style.height = "100px";
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HTML Network CSS Javascript DOM CSSOM Render Tree
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HTML Network CSS Javascript DOM CSSOM Render Tree Layout
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HTML Network CSS Javascript DOM CSSOM Render Tree Layout Paint
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CRITICAL PATH
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ANYTHING IN THE WAY OF INITIAL RENDER IS CRITICAL
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Hey there
Super awesome site
Super interesting stuff, I'm sure.
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Hey there
Super awesome site
Super interesting stuff, I'm sure.
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Hey there
Super awesome site
Super interesting stuff, I'm sure.
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Hey there
Super awesome site
Super interesting stuff, I'm sure.
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Hey there
Super awesome site
Super interesting stuff, I'm sure.
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.main- navigation #mixer .links
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//critical css inlined and minimized loadCSS(‘/path/to/full/css’); //set a cookie
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Hey there //critical css inlined and minimized
Super awesome site
Super interesting stuff, I'm sure.
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http://bit.ly/1Jw2jj7
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PROGRESS BARS ARE THE HOLD MUSIC OF THE INTERNET
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PROGRESS BARS FOCUS ON THE WAITING
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http://www.lukew.com/ff/entry.asp?1797
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http://www.lukew.com/ff/entry.asp?1797
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http://www.lukew.com/ff/entry.asp?1797
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SKELETON SCREENS FOCUS ON THE PROGRESS
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FOCUS ON WHAT YOU DON’T HAVE
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FOCUS ON WHAT YOU’RE GOING TO GET
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DIV DIV DIV
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FEEDBACK SHOWS PROGRESS
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FEEDBACK EASES ANXIETY
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https://flic.kr/p/7WcQwA CHOREOGRAPHY
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PERFORMANCE IS ABOUT THE USER
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PERCEPTION FRAMES REALITY
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https://flic.kr/p/7WcQwA USER-CENTRIC PERFORMACE
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THANK YOU https://flic.kr/p/cxeNPs Tim Kadlec | @tkadlec | #fronttrends