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TDCSF14: Developing fast and efficient Tizen HT...
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Aki Saarinen
June 03, 2014
Programming
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190
TDCSF14: Developing fast and efficient Tizen HTML5 mobile applications: Lessons Learned
Aki Saarinen
June 03, 2014
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Transcript
FAST and EFFICIENT Tizen HTML5 mobile applications AKI SAARINEN, REAKTOR
JAPAN @akisaarinen http://reaktor.co.jp/en/
‹#› FAST & EFFICIENT
‹#› Premature optimization is the root of all evil —
Donald Knuth “
‹#›
‹#› 1 Measure! 2 Start-up time 3 Run-time performance
‹#› 1 MEASURE!
‹#› Measure twice cut once “ — my dad
‹#› • WebKit Web Inspector • Tizendev: start-up time •
Tizendev: framerate Available tools
‹#› WebKit Web Inspector
‹#› TizenDev • Automated deploying of app • Automated start-up
timing • Automated FPS measurements • http://github.com/reaktor/tizendev
‹#› TizenDev: start-up time runs: 30
mean: 1708ms std: 63ms
‹#› TizenDev: framerate samples: 100 mean:
58 FPS std: 4 FPS
‹#› 2 START-UP
‹#› LESS IS MORE
‹#› • Lazy-loading • Minification • Reflow • Native API
calls • Parallelization
‹#› Large codebase, all loaded and parsed at start-up time
‹#› Large codebase, all loaded and parsed at start-up time
‹#› Code for first screen Modularized code, show other views
on-demand
‹#› UglifyJS, Closure Compiler, .. 1 kilobyte ~= 1 ms
‹#› Reflow
‹#› Avoid reflow REALLY!
‹#› Example: Calling width() of an element
‹#› ! container.find("li").each(function() { var listItem = $(this);
listItem.text(item.width()); }); ! forces reflow
‹#› container.appendTo($("body")); ! container.find("li").each(function() { var listItem
= $(this); listItem.text(item.width()); }); ! container.detach();
‹#› container.appendTo($("body")); ! container.find("li").each(function() { var listItem
= $(this); listItem.text(item.width()); }); ! container.detach();
‹#› 1000 elements (MacBook Pro) ! 2000 ms 60 ms
‹#› • Defer execution • Use local storage • Only
fetch needed data Native APIs
‹#› Parallelize
‹#›
‹#›
‹#› • Do lazy-loading • Use minification • Avoid reflow
• Careful with native APIs • Parallelize
‹#› 3 RUN-TIME
‹#› 60 FPS
‹#› • DOM modifications • Pre-loading • CSS3 transitions •
Scrolling
‹#› DOM = SLOW
‹#› display: none; ! + 5-10 FPS
‹#› 2 1 3 (pre-load) (pre-load) visible
‹#› Accelerated CSS3 transitions
‹#› jQuery.animate() CSS3 NO: YES:
‹#› left: 0px -> 100px translate3d() NO: YES:
‹#› background-color: ...; opacity: 0.2; NO: YES:
‹#› -webkit-transform: translate3d(0,0,0); http://stackoverflow.com/questions/3461441/prevent-flicker-on-webkit-transition-of-webkit-transform Enable 3D acceleration
‹#› Trigger animation in next render cycle
‹#› setTimeout(function() { element.css(
“-‐webkit-‐transform”, “translate3d(100,0,0)” ); }, 0);
‹#› iScroll or other JavaScript library overflow: scroll; -webkit-overflow-scroll:
touch; Momentum scrolling NO: NO: YES:
‹#› • DOM is slow • Do pre-loading • Use
CSS3 transitions • Use overflow scrolling
‹#› 1 Measure! 2 Start-up time 3 Run-time performance Re-cap!
‹#› • Performance is important • Measure before optimizing •
Minimize actions at start-up • Pay attention to FPS
‹#› Thank you! @akisaarinen
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