Building for performance and resilience

1. BUILDING FOR @andyhume SmashingConf, New York, 2014 PERFORMANCE RESILIENCE Tuesday, June 17, 14
2. WHY CARE? http://www.strangeloopnetworks.com/resources/infographics/web-performance-and-ecommerce/ Tuesday, June 17, 14
3. WHY CARE? http://www.strangeloopnetworks.com/resources/infographics/web-performance-and-ecommerce/ Tuesday, June 17, 14
4. WHY CARE? http://www.strangeloopnetworks.com/resources/infographics/web-performance-and-ecommerce/ Tuesday, June 17, 14
5. WHY CARE? http://www.strangeloopnetworks.com/resources/infographics/web-performance-and-ecommerce/ Tuesday, June 17, 14
6. WHY CARE? http://www.strangeloopnetworks.com/resources/infographics/web-performance-and-ecommerce/ Tuesday, June 17, 14
7. WHY CARE? http://www.strangeloopnetworks.com/resources/infographics/web-performance-and-ecommerce/ Tuesday, June 17, 14
8. Measure http://www.flickr.com/photos/kayaker1204/4319542459/ Tuesday, June 17, 14
9. Measure http://www.flickr.com/photos/kayaker1204/4319542459/ We have a median page load me of seven seconds, and our primary compe tor has a median page load me of three seconds. Tell a story Tuesday, June 17, 14
10. Measure http://www.flickr.com/photos/kayaker1204/4319542459/ Page load mes increased by 25% when we added feature x. Tell a story Tuesday, June 17, 14
11. Your bosses love a story http://www.flickr.com/photos/kayaker1204/4319542459/ Tuesday, June 17, 14
12. Spread the word http://www.flickr.com/photos/kayaker1204/4319542459/ Tuesday, June 17, 14
13. What numbers?! http://www.flickr.com/photos/kayaker1204/4319542459/ Tuesday, June 17, 14
14. What numbers?! http://www.flickr.com/photos/kayaker1204/4319542459/ Page load time? Total download size? Start render time? Time to first byte? Response time? Total HTTP requests? Document load time? Tuesday, June 17, 14
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22. Load Time First Byte Start Render Fully Loaded Speed Index FIRST VIEW 3.783s 0.128s 0.676s 6.530s 1522 REPEAT VIEW 2.268s 0.486s 0.486s 3.617s 980 Tuesday, June 17, 14
23. Load Time First Byte Start Render Fully Loaded Speed Index FIRST VIEW 3.783s 0.128s 0.676s 6.530s 1522 REPEAT VIEW 2.268s 0.486s 0.486s 3.617s 980 Tuesday, June 17, 14
24. Load Time First Byte Start Render Fully Loaded Speed Index FIRST VIEW 3.783s 0.128s 0.676s 6.530s 1522 REPEAT VIEW 2.268s 0.486s 0.486s 3.617s 980 Tuesday, June 17, 14
25. Measure and tracking trends http://www.flickr.com/photos/kayaker1204/4319542459/ Tuesday, June 17, 14
26. SpeedCurve http://speedcurve.com Tuesday, June 17, 14
27. SpeedCurve http://speedcurve.com Tuesday, June 17, 14
28. How to optimize http://www.flickr.com/photos/freefoto/2231356418/ Tuesday, June 17, 14
29. Web performance 101 http://www.flickr.com/photos/freefoto/2231356418/ Content-Encoding: gzip Cache-Control: max-age=315360000 Tuesday, June 17, 14
30. Optimizing: First byte http://www.flickr.com/photos/freefoto/2231356418/ Load Time First Byte Start Render Fully Loaded Speed Index FIRST VIEW 3.783s 0.128s 0.676s 6.530s 1522 REPEAT VIEW 2.268s 0.486s 0.486s 3.617s 980 Tuesday, June 17, 14
31. Optimizing: First byte DNS lookup TCP connect HTTP request Server time HTTP resp Tuesday, June 17, 14
32. Optimizing: First byte DNS lookup TCP connect HTTP request Server time HTTP resp Tuesday, June 17, 14
33. Optimizing: First byte DNS lookup TCP connect HTTP request Server time HTTP resp Tuesday, June 17, 14
34. Optimizing: First byte DNS lookup TCP connect HTTP request Server time HTTP resp Tuesday, June 17, 14
35. Optimizing: First byte DNS lookup TCP connect HTTP request Server time HTTP resp SSL Handshake Tuesday, June 17, 14
36. Optimizing: First byte DNS lookup TCP connect HTTP request Server time HTTP resp HTTP Redirect SSL Handshake Tuesday, June 17, 14
37. Optimizing: First byte DNS lookup TCP connect HTTP request Server time HTTP resp HTTP Redirect SSL Handshake Tuesday, June 17, 14
38. Optimizing: First byte DNS lookup TCP connect HTTP request Server time HTTP resp HTTP Redirect SSL Handshake Tuesday, June 17, 14
39. Optimizing: First byte DNS lookup TCP connect HTTP request Server time HTTP resp HTTP Redirect SSL Handshake Tuesday, June 17, 14
40. Optimizing: First byte DNS lookup TCP connect HTTP request Server time HTTP resp HTTP Redirect SSL Handshake Tuesday, June 17, 14
41. Eliminate redirects Just eleminate redirects Flush the document early? Prefetch DNS? But really, just eleminate redirects Optimizing: First byte Tuesday, June 17, 14
42. Optimizing: Start render http://www.flickr.com/photos/freefoto/2231356418/ Load Time First Byte Start Render Fully Loaded Speed Index FIRST VIEW 3.783s 0.128s 0.676s 6.530s 1522 REPEAT VIEW 2.268s 0.486s 0.486s 3.617s 980 Tuesday, June 17, 14
43. Optimizing: Start render HTML parser DOM tree Layout Paint Render tree Tuesday, June 17, 14
44. Optimizing: Start render HTML parser DOM tree Layout Paint Render tree Tuesday, June 17, 14
45. Remote JS Optimizing: Start render HTML parser DOM tree Layout Paint Render tree Tuesday, June 17, 14
46. Optimizing: Start render HTML parser DOM tree Layout Paint Render tree Tuesday, June 17, 14
47. inline script waiting on remote CSS Optimizing: Start render HTML parser DOM tree Layout Paint Render tree Tuesday, June 17, 14
48. Optimizing: Start render HTML parser DOM tree Layout Paint Render tree Tuesday, June 17, 14
49. Optimizing: Start render HTML parser DOM tree Layout Paint Render tree Tuesday, June 17, 14
50. Optimizing: Start render HTML parser DOM tree Layout Paint Render tree fetching remote stylesheets Tuesday, June 17, 14
51. Optimizing: Start render HTML parser DOM tree Layout Paint Render tree Tuesday, June 17, 14
52. Optimizing: Start render HTML parser DOM tree Layout Paint Render tree Tuesday, June 17, 14
53. Optimizing: Start render HTML parser DOM tree Layout Paint Render tree Tuesday, June 17, 14
54. Optimizing: Start render HTML parser DOM tree Layout Paint Render tree Tuesday, June 17, 14
55. Avoid blocking scripts Optimizing: Start render Tuesday, June 17, 14
56. Optimizing: Start render <script> var script = document.createElement('script'); script.src = "app.js"; document.head.appendChild(script); </script> Tuesday, June 17, 14
57. Optimizing: Start render <script> var script = document.createElement('script'); script.src = "app.js"; document.head.appendChild(script); </script> BREAKS THE PRE-PARSER! Tuesday, June 17, 14
58. Optimizing: Start render HTML parser DOM tree Layout Paint Render tree HTML pre- parser Tuesday, June 17, 14
59. Remote JS Optimizing: Start render HTML parser DOM tree Layout Paint Render tree HTML pre- parser Tuesday, June 17, 14
60. Optimizing: Start render HTML parser DOM tree Layout Paint Render tree HTML pre- parser Tuesday, June 17, 14
61. Optimizing: Start render HTML parser DOM tree Layout Paint Render tree HTML pre- parser fetching remote stylesheets Tuesday, June 17, 14
62. Optimizing: Start render HTML parser DOM tree Layout Paint Render tree HTML pre- parser Tuesday, June 17, 14
63. Optimizing: Start render <script> var script = document.createElement('script'); script.src = "app.js"; document.head.appendChild(script); </script> BREAKS THE PRE-PARSER! Tuesday, June 17, 14
64. Optimizing: Start render <script src="app.js" async defer></script> Tuesday, June 17, 14
65. Avoid blocking scripts Optimizing: Start render Move script elements to end of <body> Or... add async attribute to script elements Inline critical CSS Tuesday, June 17, 14
66. Avoid blocking scripts Optimizing: Start render Move script elements to end of <body> Or... add async attribute to script elements Inline critical CSS https://github.com/pocketjoso/penthouse Tuesday, June 17, 14
67. Optimizing: Load time fully loaded http://www.flickr.com/photos/freefoto/2231356418/ Load Time First Byte Start Render Fully Loaded Speed Index FIRST VIEW 3.783s 0.128s 0.676s 6.530s 1522 REPEAT VIEW 2.268s 0.486s 0.486s 3.617s 980 Tuesday, June 17, 14
68. gzip compression (of course!) Far-future caching (of course!) Concatenate files (of course!) Optimizing: Load time fully loaded Tuesday, June 17, 14
69. Optimizing: Speed Index http://www.flickr.com/photos/freefoto/2231356418/ Load Time First Byte Start Render Fully Loaded Speed Index FIRST VIEW 3.783s 0.128s 0.676s 6.530s 1522 REPEAT VIEW 2.268s 0.486s 0.486s 3.617s 980 Tuesday, June 17, 14
70. http://www.flickr.com/photos/vpickering/6824364286/ Resilience Tuesday, June 17, 14
71. http://www.flickr.com/photos/the_jorr/325224175/ Unreliable Tuesday, June 17, 14
72. http://www.flickr.com/photos/8040811@N06/3167877765 Progressive enhancement th Tuesday, June 17, 14
73. The future http://www.flickr.com/photos/kayaker1204/4319542459/ Tuesday, June 17, 14
74. Future: HTTP/2 SPDY Tuesday, June 17, 14
75. Future: HTTP/2 SPDY Multiplexing Cache pushing Tuesday, June 17, 14
76. Future: ServiceWorker Tuesday, June 17, 14
77. Future: ServiceWorker this.addEventListener('fetch', function (e) { if (e.request.url.host === 'guardian.co.uk') { e.forwardTo('http://theguardian.com'); } } (Possibly not possible) Tuesday, June 17, 14
78. Future: ServiceWorker this.addEventListener('fetch', function (e) { if (window.innerWidth > 500) { e.forwardTo(e.request.url + '?width=large'); } } (Possibly not possible) Tuesday, June 17, 14
79. Experiment and measure http://www.flickr.com/photos/kayaker1204/4319542459/ Tuesday, June 17, 14
80. Experiment and measure http://www.flickr.com/photos/kayaker1204/4319542459/ Theorize Experiment, and... Measure Tuesday, June 17, 14
81. Thank-you! http://lanyrd.com/sdbmhb @andyhume Creative Commons Licensed Attribution, Non-Commercial, Share Alike cc Tuesday, June 17, 14