A World of Content on Every Web Site
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The document discusses the complexity of web page components and their impact on load times, emphasizing the need for careful construction and performance monitoring. A significant portion of web content comes from third parties, necessitating effective strategies for managing and monitoring this external content. It also suggests using various tools for performance analysis and establishing clear service level agreements for third-party services.
A World of Content on Every Web Site
- 1. A world of content on every web site Eric Goldsmith February 18, 2010
- 2. Anatomy of a Web page Behind a Web page is a complex array of components Many individual objects are loaded for each page Page 2
- 3. Anatomy of a Web page Source: webpagetest.org The key to faster pages is measuring and understanding the component objects Page 3
- 4. Page construction and delivery impact load time Your pages could be slowed down by poor construction: Too many objects Objects that are too large Objects loading in non-optimal order Overly complex scripts Or poor delivery: Not using a Content Delivery Network (CDN) Inadequate content caching Page 4
- 5. Fix what you control … These books should be on the shelf of every Web developer and performance engineer All the ‘hows’ and ‘whys’ of Web site performance Page 5
- 6. Fix what you control … And the use of one or more of these tools should be a routine part of your development workflow: Webpagetest – www.webpagetest.org YSlow – developer.yahoo.com/yslow PageSpeed – code.google.com/speed/page-speed KITE – kite.keynote.com Page 6
- 7. … manage what you don’t How much of the content of your Web site it not within your direct control? Advertising Partner content Widgets Tracking / Analytics Content Delivery Networks (CDNs) Hmm, how much of my site is that stuff? Page 7
- 8. How much content is from 3rd parties? An informal look at top Web sites revealed that 40 – 90% of page content came from 3rd parties The more 3rd party content, the more you’re relying on someone else for your site’s performance And the more important it is to monitor performance Page 8
- 9. Performance monitoring Production Web site performance should be monitored… At regular intervals Several times an hour From various geographic locations Monitor from where your users are With sufficient granularity Enough data points to be statistically significant Object-level monitoring to help with troubleshooting Page 9
- 10. Getting a handle on 3rd party performance What happened? One issue or two? My content or 3rd party? Who owns resolution? Page 10
- 11. Getting a handle on 3rd party performance The traditional troubleshooting approach… Analysts pour over various charts & metrics Time consuming and tedious Something new… Object domains mapped to categories. For example: O&O (Owned and Operated) CDN (3rd-party Content Delivery Networks) 3rdParty (All other content, including ads, etc) Page 11
- 12. Getting a handle on 3rd party performance More actionable information: two separate issues area of ownership clear(er) Page 12
- 13. Getting a handle on 3rd party performance Viewing performance by domain/object category Data segregation and visualization technique to speed problem identification and resolution Available commercially in several tools For example, Keynote’s Virtual Pages Page 13
- 14. Tips for managing 3rd party performance Mitigate impact to your pages Load 3rd party ads, widgets, modules, etc. asynchronously (i.e. not blocking page content) to minimize the impact to your page Monitor performance with external tool(s) Independent of you or your 3rd party content providers Give 3rd party content providers access to the data/reports Ensure a defined support/escalation path e.g. who to call, hours of support, etc. Page 14
- 15. Tips for managing 3rd party performance For Service Level Agreements (SLAs), be sure to define: How performance is measured e.g. tool, test frequency, geographic location, data aggregation (mean, median, percentile), etc. Define what constitutes a failure e.g. more than 3 failed tests in any 1 hour period from > 2 locations Who’s responsible for the cost and staffing of monitoring Define financial impact of failure to meet SLA Page 15
- 16. Thank you Contact info eric.goldsmith@corp.aol.com www.ericgoldsmith.com Page 16