Northeastern Lunch and Learn

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Northeastern Tech Talk Jonathan Klein 6/17/14 @jonathanklein

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Slides, Links http://jkle.in/neu

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About Me

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About Me • Senior Performance Engineer At Etsy

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About Me • Senior Performance Engineer At Etsy • I write the Etsy Site Performance Reports

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About Me • Senior Performance Engineer At Etsy • I write the Etsy Site Performance Reports • Organize Boston Web Perf Meetup Group

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The Value of Performance

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Real World Examples

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Real World Examples • Firefox: -2.2 seconds = 15.4% more downloads

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Real World Examples • Firefox: -2.2 seconds = 15.4% more downloads • Shopzilla: -5 seconds = 7-12% increase in revenue

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Real World Examples • Firefox: -2.2 seconds = 15.4% more downloads • Shopzilla: -5 seconds = 7-12% increase in revenue • Google: +400ms = 0.76% fewer searches

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Real World Examples • Firefox: -2.2 seconds = 15.4% more downloads • Shopzilla: -5 seconds = 7-12% increase in revenue • Google: +400ms = 0.76% fewer searches • Amazon: +100ms = -1% revenue

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Real World Examples • Firefox: -2.2 seconds = 15.4% more downloads • Shopzilla: -5 seconds = 7-12% increase in revenue • Google: +400ms = 0.76% fewer searches • Amazon: +100ms = -1% revenue • http://www.phpied.com/the-performance-business-pitch/

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What About a University?

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What About a University? • More applicants

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What About a University? • More applicants • Happier Students/Faculty

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What About a University? • More applicants • Happier Students/Faculty • Increased endowment contributions

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Today’s Focus

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Today’s Focus 1. Number of Bytes (Page Weight)

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Today’s Focus 1. Number of Bytes (Page Weight) 2. What Kind of Bytes

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Today’s Focus 1. Number of Bytes (Page Weight) 2. What Kind of Bytes 3. How They Are Delivered

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80% of page load time takes place on the client

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1. Page Weight

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http://httparchive.org/interesting.php#bytesperpage

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Things to do now

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Things to do now • Gzip text resources (CSS/JS)

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Things to do now • Gzip text resources (CSS/JS) • Minify CSS/JS

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Things to do now • Gzip text resources (CSS/JS) • Minify CSS/JS • Optimize Images

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Things to do now • Gzip text resources (CSS/JS) • Minify CSS/JS • Optimize Images • smush.it (web)

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Things to do now • Gzip text resources (CSS/JS) • Minify CSS/JS • Optimize Images • smush.it (web) • Wesley (command line)

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Things to do now • Gzip text resources (CSS/JS) • Minify CSS/JS • Optimize Images • smush.it (web) • Wesley (command line)

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2. The Right Bytes

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/scripts/modernizr.js /scripts/mosaic.1.0.1.min.js /scripts/jquery.hashchange.min.js /scripts/jquery.easytabs.min.js /scripts/top-nav.js /scripts/content-swap.js /scripts/easytabs-settings.js /scripts/social-media-pane.js /scripts/jquery.touchSwipe.min.js /scripts/show-more.js /scripts/googleSearch.js /scripts/touchswipe-settings.js /scripts/mosaic-settings.js /scripts/jquery.ﬂexslider.js /scripts/jquery.tmpl.min.js /scripts/facebook-wall.js /scripts/mobile-nav.js

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Problems With JavaScript

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Problems With JavaScript • Blocks the main thread

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Problems With JavaScript • Blocks the main thread • Parse and execution time

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Problems With JavaScript • Blocks the main thread • Parse and execution time • Eats up CPU/battery on mobile

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Not All Bytes Are Created Equal

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3. Delivering The Bytes

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KeepAlive On

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Things to do now

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Things to do now • Turn on KeepAlive in Your Apache Config

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Things to do now • Turn on KeepAlive in Your Apache Config • Consolidate CSS/JS files

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Things to do now • Turn on KeepAlive in Your Apache Config • Consolidate CSS/JS files • Add Caching Headers

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Quick Recap

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One Day of Work

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One Day of Work 1. Gzip text resources (CSS/JS)

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One Day of Work 1. Gzip text resources (CSS/JS) 2. Turn on KeepAlive

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One Day of Work 1. Gzip text resources (CSS/JS) 2. Turn on KeepAlive 3. Minify CSS/JS

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One Day of Work 1. Gzip text resources (CSS/JS) 2. Turn on KeepAlive 3. Minify CSS/JS 4. Optimize Images

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One Day of Work 1. Gzip text resources (CSS/JS) 2. Turn on KeepAlive 3. Minify CSS/JS 4. Optimize Images 5. Add Caching Headers

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One Day of Work 1. Gzip text resources (CSS/JS) 2. Turn on KeepAlive 3. Minify CSS/JS 4. Optimize Images 5. Add Caching Headers 6. Eliminate unnecessary JavaScript

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One Day of Work 1. Gzip text resources (CSS/JS) 2. Turn on KeepAlive 3. Minify CSS/JS 4. Optimize Images 5. Add Caching Headers 6. Eliminate unnecessary JavaScript 7. Consolidate CSS/JS files