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Northeastern Lunch and Learn
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Jonathan Klein
June 18, 2014
Technology
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Northeastern Lunch and Learn
A Web Performance 101 talk given at Northeastern in June 2014.
Jonathan Klein
June 18, 2014
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Transcript
Northeastern Tech Talk Jonathan Klein 6/17/14 @jonathanklein
Slides, Links http://jkle.in/neu
About Me
About Me • Senior Performance Engineer At Etsy
About Me • Senior Performance Engineer At Etsy • I
write the Etsy Site Performance Reports
About Me • Senior Performance Engineer At Etsy • I
write the Etsy Site Performance Reports • Organize Boston Web Perf Meetup Group
The Value of Performance
None
Real World Examples
Real World Examples • Firefox: -2.2 seconds = 15.4% more
downloads
Real World Examples • Firefox: -2.2 seconds = 15.4% more
downloads • Shopzilla: -5 seconds = 7-12% increase in revenue
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
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
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/
What About a University?
What About a University? • More applicants
What About a University? • More applicants • Happier Students/Faculty
What About a University? • More applicants • Happier Students/Faculty
• Increased endowment contributions
Today’s Focus
Today’s Focus 1. Number of Bytes (Page Weight)
Today’s Focus 1. Number of Bytes (Page Weight) 2. What
Kind of Bytes
Today’s Focus 1. Number of Bytes (Page Weight) 2. What
Kind of Bytes 3. How They Are Delivered
80% of page load time takes place on the client
1. Page Weight
http://httparchive.org/interesting.php#bytesperpage
None
None
None
Things to do now
Things to do now • Gzip text resources (CSS/JS)
Things to do now • Gzip text resources (CSS/JS) •
Minify CSS/JS
Things to do now • Gzip text resources (CSS/JS) •
Minify CSS/JS • Optimize Images
Things to do now • Gzip text resources (CSS/JS) •
Minify CSS/JS • Optimize Images • smush.it (web)
Things to do now • Gzip text resources (CSS/JS) •
Minify CSS/JS • Optimize Images • smush.it (web) • Wesley (command line)
Things to do now • Gzip text resources (CSS/JS) •
Minify CSS/JS • Optimize Images • smush.it (web) • Wesley (command line)
2. The Right Bytes
None
None
/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
Problems With JavaScript
Problems With JavaScript • Blocks the main thread
Problems With JavaScript • Blocks the main thread • Parse
and execution time
Problems With JavaScript • Blocks the main thread • Parse
and execution time • Eats up CPU/battery on mobile
Not All Bytes Are Created Equal
3. Delivering The Bytes
None
None
None
None
None
KeepAlive On
None
None
None
Things to do now
Things to do now • Turn on KeepAlive in Your
Apache Config
Things to do now • Turn on KeepAlive in Your
Apache Config • Consolidate CSS/JS files
Things to do now • Turn on KeepAlive in Your
Apache Config • Consolidate CSS/JS files • Add Caching Headers
Quick Recap
One Day of Work
One Day of Work 1. Gzip text resources (CSS/JS)
One Day of Work 1. Gzip text resources (CSS/JS) 2.
Turn on KeepAlive
One Day of Work 1. Gzip text resources (CSS/JS) 2.
Turn on KeepAlive 3. Minify CSS/JS
One Day of Work 1. Gzip text resources (CSS/JS) 2.
Turn on KeepAlive 3. Minify CSS/JS 4. Optimize Images
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
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
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
Thanks!
@jonathanklein ! jonathan@etsy.com Get in Touch