Frontend Performance: Beginner to Expert to Crazy Person (San Diego Web Perf meetup)
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Frontend Performance: Beginner to Expert to Crazy Person (San Diego Web Perf meetup)

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San Diego web performance meetup: http://www.meetup.com/Web-Performance-SanDiego/events/184559312/

San Diego web performance meetup: http://www.meetup.com/Web-Performance-SanDiego/events/184559312/

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Frontend Performance: Beginner to Expert to Crazy Person (San Diego Web Perf meetup) Frontend Performance: Beginner to Expert to Crazy Person (San Diego Web Perf meetup) Presentation Transcript

  • FE Performance: Beginner to Expert to Crazy Person Philip Tellis / ptellis@soasta.com San Diego Web Performance Meetup / 2014-08-06 San Diego Web Performance Meetup / 2014-08-06 FE Performance: Beginner to Expert to Crazy Person 1
  • • Philip Tellis • @bluesmoon • ptellis@soasta.com • SOASTA • boomerang San Diego Web Performance Meetup / 2014-08-06 FE Performance: Beginner to Expert to Crazy Person 2
  • Get the most benefit with the least effort San Diego Web Performance Meetup / 2014-08-06 FE Performance: Beginner to Expert to Crazy Person 3
  • Bandwidth San Diego Web Performance Meetup / 2014-08-06 FE Performance: Beginner to Expert to Crazy Person 4
  • Patience San Diego Web Performance Meetup / 2014-08-06 FE Performance: Beginner to Expert to Crazy Person 5
  • 0Beginning Web Performance San Diego Web Performance Meetup / 2014-08-06 FE Performance: Beginner to Expert to Crazy Person 6
  • Start with a really slow site San Diego Web Performance Meetup / 2014-08-06 FE Performance: Beginner to Expert to Crazy Person 7
  • 0.1 Start Measuring San Diego Web Performance Meetup / 2014-08-06 FE Performance: Beginner to Expert to Crazy Person 8
  • Or use RUM for real user data (boomerang/mPulse) San Diego Web Performance Meetup / 2014-08-06 FE Performance: Beginner to Expert to Crazy Person 9
  • 0.2 enable gzip http://slideshare.net/billwscott/improving-netflix-performance-experience San Diego Web Performance Meetup / 2014-08-06 FE Performance: Beginner to Expert to Crazy Person 10
  • You can pre-gzip gzip_static in nginx San Diego Web Performance Meetup / 2014-08-06 FE Performance: Beginner to Expert to Crazy Person 11
  • 0.3 ImageOptim San Diego Web Performance Meetup / 2014-08-06 FE Performance: Beginner to Expert to Crazy Person 12
  • 0.4 Cache Cache-control: public, max-age=31415926 http://www.mnot.net/cache_docs/ San Diego Web Performance Meetup / 2014-08-06 FE Performance: Beginner to Expert to Crazy Person 13
  • Yes, that was 10 million pies San Diego Web Performance Meetup / 2014-08-06 FE Performance: Beginner to Expert to Crazy Person 14
  • 0 Congratulations You’ve just been promoted San Diego Web Performance Meetup / 2014-08-06 FE Performance: Beginner to Expert to Crazy Person 15
  • 1What the Experts Do San Diego Web Performance Meetup / 2014-08-06 FE Performance: Beginner to Expert to Crazy Person 16
  • 1.1 CDN Serve your root domain through a CDN San Diego Web Performance Meetup / 2014-08-06 FE Performance: Beginner to Expert to Crazy Person 17
  • 1.1 CDN And make sure your CSS is on the same domain http://www.jonathanklein.net/2014/02/revisiting-cookieless-domain.html San Diego Web Performance Meetup / 2014-08-06 FE Performance: Beginner to Expert to Crazy Person 18
  • 1.1 CDN Google Chrome will open two TCP connections to the primary host, one for the page, and the second "just in case" San Diego Web Performance Meetup / 2014-08-06 FE Performance: Beginner to Expert to Crazy Person 19
  • 1.2 Split JavaScript "critical": in the HEAD, "enhancements": loaded async San Diego Web Performance Meetup / 2014-08-06 FE Performance: Beginner to Expert to Crazy Person 20
  • 1.3 Audit your CSS Chrome WebDev tools San Diego Web Performance Meetup / 2014-08-06 FE Performance: Beginner to Expert to Crazy Person 21
  • Also checkout uncss for a command line option San Diego Web Performance Meetup / 2014-08-06 FE Performance: Beginner to Expert to Crazy Person 22
  • 1.4 Parallelise downloads/use sprites You can have higher bandwidth, you cannot have lower latency. San Diego Web Performance Meetup / 2014-08-06 FE Performance: Beginner to Expert to Crazy Person 23
  • 1.5 Flush Early and Often Get bytes to the client ASAP to avoid TCP Slow Start, and speed up CSS San Diego Web Performance Meetup / 2014-08-06 FE Performance: Beginner to Expert to Crazy Person 24
  • 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/ San Diego Web Performance Meetup / 2014-08-06 FE Performance: Beginner to Expert to Crazy Person 25
  • 1.6 Increase initcwnd San Diego Web Performance Meetup / 2014-08-06 FE Performance: Beginner to Expert to Crazy Person 26
  • 1.6b Also... net.ipv4.tcp_slow_start_after_idle=0 http://www.lognormal.com/blog/2012/09/27/linux-tcpip-tuning/ San Diego Web Performance Meetup / 2014-08-06 FE Performance: Beginner to Expert to Crazy Person 27
  • 1.7 PageSpeed mod_pagespeed and ngx_pagespeed San Diego Web Performance Meetup / 2014-08-06 FE Performance: Beginner to Expert to Crazy Person 28
  • Relax San Diego Web Performance Meetup / 2014-08-06 FE Performance: Beginner to Expert to Crazy Person 29
  • 2You’ve reached crazyland San Diego Web Performance Meetup / 2014-08-06 FE Performance: Beginner to Expert to Crazy Person 30
  • Sort in ascending order of signal latency • Electrons through copper • Light through fibre • Pulsars • Station Wagons • Smoke Signals San Diego Web Performance Meetup / 2014-08-06 FE Performance: Beginner to Expert to Crazy Person 31
  • 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) San Diego Web Performance Meetup / 2014-08-06 FE Performance: Beginner to Expert to Crazy Person 32
  • Study real user data Look for potential places to parallelise, predict or cache San Diego Web Performance Meetup / 2014-08-06 FE Performance: Beginner to Expert to Crazy Person 33
  • 2.1 Pre-load Pre-fetch assets required for the next page in a process flow San Diego Web Performance Meetup / 2014-08-06 FE Performance: Beginner to Expert to Crazy Person 34
  • 2.1b pre-render <link rel="prerender" href="url"> <link rel="subresource" href=""> <link rel="dns-prefetch" href=""> San Diego Web Performance Meetup / 2014-08-06 FE Performance: Beginner to Expert to Crazy Person 35
  • 2.1c onVisibilityChange And while you’re at it, don’t do expensive work if the page is hidden San Diego Web Performance Meetup / 2014-08-06 FE Performance: Beginner to Expert to Crazy Person 36
  • 2.2 Post-load Fetch optional assets after onload San Diego Web Performance Meetup / 2014-08-06 FE Performance: Beginner to Expert to Crazy Person 37
  • 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/ San Diego Web Performance Meetup / 2014-08-06 FE Performance: Beginner to Expert to Crazy Person 38
  • 2.4 Prepare for HTTP/2.0 Multiple assets on the same connection and TLS by default. Breaks many of our rules. San Diego Web Performance Meetup / 2014-08-06 FE Performance: Beginner to Expert to Crazy Person 39
  • 2.5 Understand 3PoFs Use blackhole.webpagetest.org http://blog.patrickmeenan.com/2011/10/testing-for-frontend-spof.html San Diego Web Performance Meetup / 2014-08-06 FE Performance: Beginner to Expert to Crazy Person 40
  • 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/ San Diego Web Performance Meetup / 2014-08-06 FE Performance: Beginner to Expert to Crazy Person 41
  • Can you predict round-trip-time? San Diego Web Performance Meetup / 2014-08-06 FE Performance: Beginner to Expert to Crazy Person 42
  • Can you predict round-trip-time? San Diego Web Performance Meetup / 2014-08-06 FE Performance: Beginner to Expert to Crazy Person 43
  • 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 San Diego Web Performance Meetup / 2014-08-06 FE Performance: Beginner to Expert to Crazy Person 44
  • Thank You! Questions? San Diego Web Performance Meetup / 2014-08-06 FE Performance: Beginner to Expert to Crazy Person 45
  • • Philip Tellis • @bluesmoon • philip@bluesmoon.info • www.SOASTA.com • boomerang • LogNormal Blog San Diego Web Performance Meetup / 2014-08-06 FE Performance: Beginner to Expert to Crazy Person 46
  • Image Credits • Apple Pie http://www.flickr.com/photos/24609729@N00/3353226142/ • Kittens in a PC http://www.flickr.com/photos/43525343@N08/6417971383/ San Diego Web Performance Meetup / 2014-08-06 FE Performance: Beginner to Expert to Crazy Person 47