Welcome!

Machine Learning Authors: Yeshim Deniz, Liz McMillan, Pat Romanski, Elizabeth White, Corey Roth

Related Topics: Machine Learning , Java IoT

Machine Learning : Article

Best Practices on JavaScript and AJAX Performance

JavaScript can save your day or it can cause you nightmares

JavaScript can save your day or it can cause you nightmares. JavaScript and XHR (XmlHttpRequest) enable what the industry considers to be Web 2.0 – meaning highly interactive web sites where some application logic is pushed down to the client into the browsers JavaScript engine. As with any application code – regardless of the language and runtime environment – it is easy to not follow Best Practices which ultimately negatively impact the end-user experience with the site.

dynaTrace AJAX Edition has a unique capability to trace all JavaScript execution on the web page. It also traces calls into the Browser DOM (Document Object Model) and is able to capture method arguments and return values. The following illustration shows a JavaScript trace of a script execution in the PurePath view of the dynaTrace AJAX Edition

dynaTrace JavaScript PurePath showing full execution trace including calls into the DOM, method arguments and return values

dynaTrace JavaScript PurePath showing full execution trace including calls into the DOM, method arguments and return values

By getting this level of details on JavaScript execution it is easy to identify slow running JavaScript handlers, custom javascript code, slow access to the DOM and expensive or inefficient calls into 3rd party frameworks such as jQuery

In the Best Practices for JavaScript and AJAX Performance we list all common problems we have seen when working with our AJAX Edition users, people like Steve Souders or John Resig and our commercial customers over the last couple of months. It includes recommendations on how to avoid blocking script blocks, inefficient CSS Selectors with frameworks such as jQuery, reducing DOM manipulations and XHR calls. The latest beta version of the dynaTrace AJAX Edition implements some of these Best Practices to automatically analyze slow running JavaScript code.

Related Reading:

  1. Hands-On Guide: Verifying FIFA World Cup Web Site against Performance Best Practices Whether you call it Football, Futbol, Fussball, Futebol, Calcio or...
  2. Best Practices from Zappos to deliver WOW Performance Zappos - the leading eCommerce site for shoes and apparel –...
  3. Best Practices on Web Performance Optimization (WPO) Over the last couple of years performance of web applications...
  4. Week 8 – Challenges in Tracing JavaScript Performance by Example In an earlier post I already discussed several approaches towards...
  5. How to use your Selenium Tests for automated JavaScript/AJAX Performance Analysis With more than 3 million downloads, Selenium is the world’s...

More Stories By Andreas Grabner

Andreas Grabner has been helping companies improve their application performance for 15+ years. He is a regular contributor within Web Performance and DevOps communities and a prolific speaker at user groups and conferences around the world. Reach him at @grabnerandi

CloudEXPO Stories
Headquartered in Plainsboro, NJ, Synametrics Technologies has provided IT professionals and computer systems developers since 1997. Based on the success of their initial product offerings (WinSQL and DeltaCopy), the company continues to create and hone innovative products that help its customers get more from their computer applications, databases and infrastructure. To date, over one million users around the world have chosen Synametrics solutions to help power their accelerated business or personal computing needs.
DXWordEXPO New York 2018, colocated with CloudEXPO New York 2018 will be held November 11-13, 2018, in New York City and will bring together Cloud Computing, FinTech and Blockchain, Digital Transformation, Big Data, Internet of Things, DevOps, AI, Machine Learning and WebRTC to one location.
@DevOpsSummit at Cloud Expo, taking place November 12-13 in New York City, NY, is co-located with 22nd international CloudEXPO | first international DXWorldEXPO and will feature technical sessions from a rock star conference faculty and the leading industry players in the world. The widespread success of cloud computing is driving the DevOps revolution in enterprise IT. Now as never before, development teams must communicate and collaborate in a dynamic, 24/7/365 environment. There is no time to wait for long development cycles that produce software that is obsolete at launch. DevOps may be disruptive, but it is essential.
Sanjeev Sharma Joins November 11-13, 2018 @DevOpsSummit at @CloudEXPO New York Faculty. Sanjeev Sharma is an internationally known DevOps and Cloud Transformation thought leader, technology executive, and author. Sanjeev's industry experience includes tenures as CTO, Technical Sales leader, and Cloud Architect leader. As an IBM Distinguished Engineer, Sanjeev is recognized at the highest levels of IBM's core of technical leaders.
DXWorldEXPO LLC announced today that Kevin Jackson joined the faculty of CloudEXPO's "10-Year Anniversary Event" which will take place on November 11-13, 2018 in New York City. Kevin L. Jackson is a globally recognized cloud computing expert and Founder/Author of the award winning "Cloud Musings" blog. Mr. Jackson has also been recognized as a "Top 100 Cybersecurity Influencer and Brand" by Onalytica (2015), a Huffington Post "Top 100 Cloud Computing Experts on Twitter" (2013) and a "Top 50 Cloud Computing Blogger for IT Integrators" by CRN (2015). Mr. Jackson's professional career includes service in the US Navy Space Systems Command, Vice President J.P. Morgan Chase, Worldwide Sales Executive for IBM and NJVC Vice President, Cloud Services. He is currently part of a team responsible for onboarding mission applications to the US Intelligence Community cloud computing environment (IC ...