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Tips for Optimizing Web Performance


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The network is crucial to deliver a great user experience for your application. As web pages bulk up with ads, scripts and media from remote networks it becomes harder to measure and optimize performance. ThousandEyes helps you quickly determine whether your app, your network or another network is at fault.

In these slides, we share how to:
* Measure page load time by object and network.
* Detect performance issues by third parties, such as CDNs or ad networks.
* Set up and script robust web transactions.

See the webinar at

Published in: Technology
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Tips for Optimizing Web Performance

  1. 1. Tips for Optimizing Web Performance Nick Kephart, Sr. Director of Product Marketing
  2. 2. 1 About ThousandEyes Founded by network experts; strong investor backing Relied on for critical operations by leading enterprises Recognized as an innovative new approach ThousandEyes delivers network intelligence into every network. 42 Fortune 500 5 top 5 software companies 4 top 6 US banks
  3. 3. 2 • HTTP request and response without a browser • Measures errors by type ‘HTTP Server’ tests Options for Measuring Web Performance • One or a series of page loads • With user interactions (forms, clicks) ‘Web Transaction’ tests Web Server Transactions • Page load in a web browser • Each object on the page is loaded ‘Page Load’ tests Page Load
  4. 4. 3 • HTTP Server – DNS, Connect, SSL, Wait, Receive time – Response time – Fetch time • Page Load – Response time – DOM load time – Page load time • Transaction – Transaction duration HTTP, Page Load and Transaction Metrics
  5. 5. 4 • Objects that don’t load (errors) • Multiple objects per domain (blocked time) • Latency by provider (connection time) • Server congestion, app optimization (wait time) • Wire size, throughput (receive time) The Importance of Individual Objects receive blocked wait
  6. 6. 5 • Measure response time and throughput by domain and provider • Alert by domain • Track performance of: – CDNs – Ad networks – Fonts – Scripts – Images and media – Marketing and analytics pixels – External data sources Third Party and CDN Performance Akamai Omniture, Event tracking Root, Fonts
  7. 7. 6 • Use the ThousandEyes recorder! • Get familiar with Selenium commands1 (release 1.0) and Xpath syntax2 • Clear your cookies (incognito) • Do a dry run using instant tests Recording Web Transactions 1 2
  8. 8. 7 • Transaction Step Time • Transaction Page Time New Web Performance Features • Sleep command Reports SeleniumNew! New!
  9. 9. 8 How ThousandEyes Works SaaS or external website Consumers Enterprise Agents Cloud Agent 2 Test from a consumer or telecommuter perspective Branch Data Center 1 Test from an internal employee perspective Internet
  10. 10. 9  Adjust the timeout and target times  Timeout is the maximum completion time, target time affects alerts  Configure the start and stop steps  Repeat steps if you want to compare cached and uncached results  Use Xpath where possible  Will reduce the frequency that your transactions break  Beware of dynamic IDs from frameworks such as ExtJS  Use component text, labels or the sequence of the component  Check that an element is present by inserting a wait condition  More on the blog:   Tips for Writing Web Transactions That Work!
  11. 11. 10 Demo
  12. 12. 11 Creating a Page Load Test Set the page URLChoose intervals (HTTP runs availability and network tests) Select alerts Views that are included
  13. 13. 12 Page Load Results See response time and throughput by domain and provider Select an agent to see the waterfall Various layers of network and app data
  14. 14. 13 Component-Specific Alerts Customize by components Duplicate rule
  15. 15. 14 Creating a Transaction Test Choose the base URL Import from the Recorder or your own Selenium script Transaction tests don’t include network tests; create an HTTP Server test as well Adjust start and end
  16. 16. 15 Transaction Results Toggle between metrics Timing by step and page Select an agent to see the page load waterfalls
  17. 17. 16 See what you’re missing. Watch the webinar