Codegarden 2016

Talk on web performance and Umbraco. Given at Codegarden 2016 in Odense, Denmark.

Transcript

1. #webperf and Umbraco Codegarden 2016 – Odense, Denmark
2. Matt Shull Director of Aristotle Labs mattshull.com" @themattshull" mshull@aristotleweb.com
3. aristotlelabs.com/cg16
4. Why Performance Matters First and foremost, we believe that speed is more than a feature. Speed is the most important feature. -Fred Wilson
5. Why Performance Matters
6. Why Performance Matters
8. 40% of users will abandon a request if it doesn’t load within 3 seconds.
10. 2% increase in conversions for every 1 second load time decreased
11. 80% decrease in" load time 80% increase in traffic 32% increase in median time spent on site
12. 0.3second decrease" in latency customers spent an extra £8 million a year
13. What is web performance?
14. Total Load Time
15. Time to First Byte TTFB measures the duration from the user or client making an HTTP request to the first byte of the page being received by the client's browser.
18. Time to First Byte •  Rendering of server side code – API calls – Slow SQL queries" •  Connection to the server – Memory leaks – Poor server resources
19. Speed Index Speed Index is the average time at which visible parts of the page are displayed. It is expressed in milliseconds and dependent on size of the view port.
20. Page Size Page size measures the number of kilobytes the site downloads to the user’s device.
21. Where do I start?
22. Images ~63% http://httparchive.org/interesting.php
23. Image File Types WebP •  Uses transparency •  Animation •  Photographs •  50%-75% smaller •  Android and Chrome
24. Image File Types JPEG2000 •  Uses transparency •  Photographs •  Sometimes smaller •  Safari
25. Responsive Images          <picture>                  <source  srcset=“./large.webp”  type=“image/webp”  media=“(min-­‐width:  800px)”>                  <source  srcset=“./large.jpf”  type=“image/jpf”  media=“(min-­‐width:  800px)”>                  <source  srcset=“./large.jpg”  type=“image/jpg”  media=“(min-­‐width:  800px)”>                  <source  srcset=“./small.webp”  type=“image/webp”  media=“(max-­‐width:  799px)”>                  <source  srcset=“./small.jpf”  type=“image/jpf”  media=“(max-­‐width:  799px)”>                  <source  srcset=“./small.jpg”  type=“image/jpg”  media=“(max-­‐width:  799px)”>                  <img  srcset=“./large.jpg”  alt=“…”>          </picture>      
26. Responsive Background Images https://modernizr.com/          .webp  .container  {    background-­‐image:  url(‘image.webp’);          }            .no-­‐webp  .container  {    background-­‐image:  url(‘image.jpeg’);          }    
27. CSS ~3.5% http://httparchive.org/interesting.php
28. CSS •  Minify files" •  Split into 3 files – Above the fold main page – Below the fold main page – Interior •  Use LoadCSS to load in below the fold css – Use <noscript> as a fallback
29. Fonts ~5.5% http://httparchive.org/interesting.php
30. Fonts •  Reduce font weights" •  Strip out characters not needed using Font Squirrel" " •  Use browser font loading events" •  FOIT vs FOUT
31. Javascript ~16% http://httparchive.org/interesting.php
32. Javascript •  Minify files •  Use HTML/CSS alternatives – Image rotators – Tabs – Responsive Navigation •  Split into mainpage.js and interior.js
33. Javascript
34. Javascript: Lessons Learned •  Javascript Libraries •  Umbraco Forms •  AJAX all the things!
35. Browser Hints •  DNS Prefetch" •  Preconnect" •  Prefetch" •  Prerender
36. Browser Hints: Prefetch Download and cache specific files once the browser is idle."   <link  rel=”prefetch"  href=”bO.min.css">    
37. Browser Hints: Prerender Download and cache an entire page."   <link  rel=“prerender”  href=“hPp://maPshull.com/umbraco”>    
38. Measuring Performance
39. Measuring Performance •  RUM – Real User Data – Measured using browser APIs •  Synthetic – Simulated User Testing – Simulated using real devices and browsers
40. Median vs Average
41. On-demand testing: WebPageTest.org Monitoring: GetSwiftSage.com Synthetic Testing
43. GetSwiftSage.com/cg16
44. Beware of False Performance Prophets •  Google AMP" •  Facebook Instant Articles •  Apple News
45. Everything should have value, because everything has a cost Tim Kadlec
46. Creating a Culture of Performance •  Has to come from the top down – Show the impact performance has on business – Use video to show you vs competitor" •  Create a Performance Budget / Specification" •  Recognize developers and designers great work
47. Performance Budget •  HTML: 5% •  CSS: 10% •  Javascript: 10% •  Images: 65% •  Fonts: 5% •  Other: 5%" •  Page Size Goal: 1500 kb (+/- 500 kb)
48. Performance Awards
49. What’s Next? •  Javascript API for detecting connection speed" •  Measuring speed index in RUM" •  How does web performance impact conversions and user behavior?
50. We’re Just Scratching the Surface •  Designing for Performance by Lara Hogan" •  Follow Tammy Everts on Twitter and Blog" •  Follow Steve Souders Twitter and Blog" •  Follow me and @getswiftsage on Twitter" •  More resources at aristotlelabs.com/cg16
51. Thank you! aristotlelabs.com/cg16 getswiftsage.com/cg16