Optimizing Modern Web Applications for High Performance

The Slide Deck from my talk at MetaRefresh (http://funnel.hasgeek.com/metarefresh/267-optimizing-modern-web-applications-for-performance).

Videos Used in the Slides are here : http://dl.dropbox.com/u/2444/MetaRefresh%20Videos.zip

Transcript

1. Building High Performance Web Applications .............................................................................................................. ..............................................................................................................
2. Karthik Kastury Perf. Engineer @ PayPal India Engineer / Hacker / Blogger / Apple fanboi and evil minded. *Pun Intended* 24x7 Internet Geek | Unlucky in Cards ................................................................................................................................ ................................................................................................................................ Blog Twitter Email http://karthik.kastury.in/ hello@karthik.kastury.in @KarthikDot Internet Addict for 12+ Years...
3. ‣ #17 Best Places to Work - India (2011) ‣ #6 in Technology Companies in India ‣ Most Innovative Company in the Finance Industry and amongst Top 50 Most Innovative Companies in the World. [1] Best Place to Work Survey - India [2] Forbes Most Innovative Companies
4. Let’s Get Started... .............................................................................................................. ..............................................................................................................
5. Building High Performance Web Applications ..............................................................................................................
6. High Performance? .............................................................................................................. ..............................................................................................................
7. Performance Engineering ‣Reduce HTTP Requests. ‣ Use Image Sprites. ‣ CSS at the top, JS at the Bottom. ‣ CSS & JS Minified and Concatenated. ‣ Use a CDN for Static Assets. .............................................................................................................. ..............................................................................................................
8. BUT THAT AIN’T ENOUGH ! .............................................................................................................. ..............................................................................................................
10. Traditional Methods are no Longer Enough. ‣ Lazy Loading FTW! ‣ Prevent Frontend SPOF. ‣ Early Flush / Chunked Responses. ‣ Async Script Loading. ‣ Google SPDY. ..............................................................................................................
11. http://blog.patrickmeenan.com/2011/10/testing-for- frontend-spof.html Frontend SPOF
12. Lazy Loading ‣ Load Scripts on Demand. ‣ Progressive Rendering - Show Only the most important parts, and progressively enhance/decorate. ‣ Render Content above the fold ASAP; and then render below the fold. ..............................................................................................................
14. Real Perf. vs Perceived Perf. ‣ Progressively Show the Content. ‣ Flush Buffers Early <?php flush(); ?> ‣ Load the Static Assets while the backend generates response. ‣ Flush at Regular Intervals. ..............................................................................................................
16. Early Flush - PayPal Here
17. Async JS Loading + Polyfills .............................................................................................................. yepnope({ test : Modernizr.geolocation, yep : 'normal.js', nope : ['polyfill.js', 'wrapper.js'] });
18. yepnope([{ load: 'http:/­/ajax.googleapis.com/ajax/libs/jquery/1.5.1/ jquery.min.js', complete: function () { if (!window.jQuery) { yepnope('local/jquery.min.js'); } } }, { load: 'jquery.plugin.js', complete: function () { jQuery(function () { jQuery('div').plugin(); }); } }]); Async JS Loading + Resource Fallbacks ..............................................................................................................
19. yepnope({ load: 'preload!jquery.1.5.0.js', callback: function (url, result, key) { window.jQuery; // undefined (but it's cached!); } }); Async JS Loading + Resource Preloading ..............................................................................................................
20. .............................................................................................................. Key Idea Download all Scripts in Parallel and Execute in Order.
21. Early Flush + Async JS Loading - PayPal Here
22. GOOGLE SPDY! .............................................................................................................. ..............................................................................................................
23. Google SPDY vs Plain Ol’ HTTP ‣ Multiplexed Streams (Single TCP Connection) ‣ Request Prioritization ‣ Header Compression ‣ Server Push ..............................................................................................................
24. Google SPDY vs Plain Ol’ HTTP .............................................................................................................. 0 25 50 75 100 Without SSL With SSL HTTP Google SPDY Normalized Data for Top 100 Sites
25. RUM (Real User Monitoring) .............................................................................................................. ..............................................................................................................
26. .............................................................................................................. Monitor in PRODUCTION ..............................................................................................................
27. The Real Story! ..............................................................................................................
28. Yahoo! Boomerang ‣ Doc Complete, Page Response, Page Processing, TTFB, DNS, Connect & more ‣ Cookie data (for parent domain) ‣ Location (geolookup on IP) ‣ Referrer ‣ User Agent ‣ Anything else you want to stuff into the beacon https://github.com/yahoo/boomerang ..............................................................................................................
29. Why RUM? .............................................................................................................. ‣ Get Real World Data. ‣ Monitor Perf. across Geographies, Browser Types. ‣ Roll out Optimizations and see how they perform with real data.
30. What to Capture? .............................................................................................................. ‣ Geo Split. ‣ 95 %ile, 90 %ile, 75 %ile and 50 %ile Load times. ‣ Browser Data. ‣ Connect times in the Wild. Readymade solutions for RUM
31. Summary .............................................................................................................. Reduce HTTP Requests. Use a CDN for Static Assets. Lazy Loading FTW! Prevent Frontend SPOF. Early Flush / Chunked Responses. Async Script Loading. Google SPDY.
32. REDUCE THE PAIN OF YOUR USERS
33. LIVE ON THE EDGE .............................................................................................................. ..............................................................................................................
34. I’m available to help ................................................................................................................................ ................................................................................................................................ Blog Twitter Email http://karthik.kastury.in/ hello@karthik.kastury.in @KarthikDot Ask http://karthik.kastury.in/ask
35. .............................................................................................................. .............................................................................................................. Q&A
36. THE END .............................................................................................................. .............................................................................................................. Or the start of something new.