Frontend Performance: Beginner to Expert to Crazy Person
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Frontend Performance: Beginner to Expert to Crazy Person

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Frontend Performance: Beginner to Expert to Crazy Person Presentation Transcript

  • 1. FE Performance: Beginner to Expert to Crazy Person Philip Tellis / ptellis@soasta.com Midwest.io / 2014-07-14 Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 1
  • 2. • Philip Tellis • @bluesmoon • ptellis@soasta.com • SOASTA • boomerang Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 2
  • 3. Get the most benefit with the least effort Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 3
  • 4. Bandwidth Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 4
  • 5. Bandwidth Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 5
  • 6. Patience Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 6
  • 7. 0Beginning Web Performance Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 7
  • 8. Start with a really slow site Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 8
  • 9. 0.1 Start Measuring Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 9
  • 10. Or use RUM for real user data (old skool) Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 10
  • 11. Or use RUM for real user data (boomerang/mPulse) Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 11
  • 12. 0.2 enable gzip http://slideshare.net/billwscott/improving-netflix-performance-experience Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 12
  • 13. You can pre-gzip gzip_static in nginx Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 13
  • 14. 0.3 ImageOptim Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 14
  • 15. 0.4 Cache Cache-control: public, max-age=31415926 http://www.mnot.net/cache_docs/ Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 15
  • 16. Yes, that was 10 million pies Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 16
  • 17. 0 Congratulations You’ve just been promoted Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 17
  • 18. 1What the Experts Do Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 18
  • 19. 1.1 CDN Serve your root domain through a CDN Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 19
  • 20. 1.1 CDN And make sure your CSS is on the same domain http://www.jonathanklein.net/2014/02/revisiting-cookieless-domain.html Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 20
  • 21. 1.1 CDN Google Chrome will open two TCP connections to the primary host, one for the page, and the second "just in case" Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 21
  • 22. 1.2 Split JavaScript "critical": in the HEAD, "enhancements": loaded async Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 22
  • 23. 1.3 Audit your CSS Chrome WebDev tools Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 23
  • 24. Also checkout uncss for a command line option Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 24
  • 25. 1.4 Parallelise downloads/use sprites You can have higher bandwidth, you cannot have lower latency. Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 25
  • 26. 1.5 Flush Early and Often Get bytes to the client ASAP to avoid TCP Slow Start, and speed up CSS Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 26
  • 27. 1.6 Increase initcwnd Initial Congestion Window: Number of packets to send before waiting for an ACK http://www.cdnplanet.com/blog/tune-tcp-initcwnd-for-optimum- performance/ Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 27
  • 28. 1.6 Increase initcwnd Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 28
  • 29. 1.6b Also... net.ipv4.tcp_slow_start_after_idle=0 http://www.lognormal.com/blog/2012/09/27/linux-tcpip-tuning/ Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 29
  • 30. 1.7 PageSpeed mod_pagespeed and ngx_pagespeed Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 30
  • 31. Relax Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 31
  • 32. 2You’ve reached crazyland Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 32
  • 33. Sort in ascending order of signal latency • Electrons through copper • Light through fibre • Pulsars • Station Wagons • Smoke Signals Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 33
  • 34. Sort in ascending order of signal latency 1 Pulsars (light through vacuum) 2 Smoke Signals (light through air) 3 Electrons through copper / Light through fibre 4 Station Wagons (possibly highest bandwidth) Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 34
  • 35. Study real user data Look for potential places to parallelise, predict or cache Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 35
  • 36. 2.1 Pre-load Pre-fetch assets required for the next page in a process flow Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 36
  • 37. 2.1b pre-render <link rel="prerender" href="url"> <link rel="subresource" href=""> <link rel="dns-prefetch" href=""> Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 37
  • 38. 2.1c onVisibilityChange And while you’re at it, don’t do expensive work if the page is hidden Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 38
  • 39. 2.2 Post-load Fetch optional assets after onload Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 39
  • 40. 2.3 Detect broken accept-encoding Many Windows anti-viruses and firewalls disable gzip by munging the Accept-Encoding header http://www.lognormal.com/blog/2012/08/17/accept-encoding-stats/ Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 40
  • 41. 2.4 Prepare for HTTP/2.0 Multiple assets on the same connection and TLS by default. Breaks many of our rules. Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 41
  • 42. 2.5 Understand 3PoFs Use blackhole.webpagetest.org http://blog.patrickmeenan.com/2011/10/testing-for-frontend-spof.html Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 42
  • 43. 2.6 Understand the IFrame Loader Technique Take required but non-critical assets out of the critical path http://www.lognormal.com/blog/2012/12/12/the-script-loader-pattern/ Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 43
  • 44. Can you predict round-trip-time? Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 44
  • 45. Can you predict round-trip-time? Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 45
  • 46. References • WebPageTest – http://webpagetest.org • Boomerang – http://lognormal.github.io/boomerang/doc/ • SOASTA mPulse – http://www.soasta.com/free • Netflix gzip study – http://www.slideshare.net/billwscott/improving-netflix-performance-experience • Nginx gzip_static – http://wiki.nginx.org/HttpGzipStaticModule • ImageOptim – http://imageoptim.com/ • uncss – https://github.com/giakki/uncss • Caching – http://www.mnot.net/cache_docs/ • Same domain CSS – http://www.jonathanklein.net/2014/02/revisiting-cookieless-domain.html • initcwnd – http://www.cdnplanet.com/blog/tune-tcp-initcwnd-for-optimum-performance/ • Linux TCP Tuning – http://www.lognormal.com/blog/2012/09/27/linux-tcpip-tuning/ • Prerender – https://developers.google.com/chrome/whitepapers/prerender • DNS prefetching – https://developer.mozilla.org/en-US/docs/Controlling_DNS_prefetching • Subresource – http://www.chromium.org/spdy/link-headers-and-server-hint/link-rel-subresource • FE SPoF – http://blog.patrickmeenan.com/2011/10/testing-for-frontend-spof.html Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 46
  • 47. Thank You! Questions? Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 47
  • 48. • Philip Tellis • @bluesmoon • philip@bluesmoon.info • www.SOASTA.com • boomerang • LogNormal Blog Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 48
  • 49. Image Credits • Jean-Antoine Nollet http://en.wikipedia.org/wiki/Jean-Antoine_Nollet • Apple Pie http://www.flickr.com/photos/24609729@N00/3353226142/ • Kittens in a PC http://www.flickr.com/photos/43525343@N08/6417971383/ Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 49