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MIROSLAV JONAŠ MIROSLAV JONAŠ (no one is talking about) THE OTHER JAVASCRIPT PERFORMANCE THE OTHER JAVASCRIPT PERFORMANCE (no one is talking about) ViennaJS, 11/22 ViennaJS, 11/22 @meeroslav @meeroslav

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Future of performance tooling High speed web Optimizing X for performance

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Monorepos Monorepos make things faster as well, you know…

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TTI FCP TBT LCP LSD NBA

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STATIC WEBSITES STATIC WEBSITES

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SSR SSR Server side

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LAZY LOADING LAZY LOADING

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HYDRATION HYDRATION

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PARTIAL HYDRATION PARTIAL HYDRATION

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ISLANDS ISLANDS

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WEBSITE AFTER INITIAL LOAD WEBSITE AFTER INITIAL LOAD

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BATTLE TESTED BATTLE TESTED

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1 2 3 4

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MUTATIONS ARE BAD

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NOT ALWAYS, THOUGH

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Repetitio est mater stu…

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?

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“NO CODE IS 
 ALWAYS FASTER THAN ANY CODE” 
 - ME

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ARRAYS VS OBJECTS

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A_RAY

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LOOKUP TABLES

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MAPS VS HASHMAPS MAPS VS HASHMAPS

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HIGHER ORDER FUNCTIONS HIGHER ORDER FUNCTIONS

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PERFORMANCE 
 DETECTION PERFORMANCE 
 DETECTION

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JSBENCH.ME

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CONSOLE.TIME 4 THE WIN

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THE BUTTERFLY EFFECT: HOW WE GAVE THE LINTER A 100X BOOST THE BUTTERFLY EFFECT: HOW WE GAVE THE LINTER A 100X BOOST

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KNOW YOUR LOOPS MUTATE WHEN EVER POSSIBLE USE ARRAYS AND MAPS SMARTLY AVOID HOF WHEN PERFORMANCE MATTERS SKIP UNNECESSARY DATA

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MIROSLAV JONAŠ MIROSLAV JONAŠ THE OTHER JAVASCRIPT PERFORMANCE THANK YOU! ViennaJS, 11/22 ViennaJS, 11/22 @meeroslav @meeroslav