Welcome!

Industrial IoT Authors: Elizabeth White, Pat Romanski, Yeshim Deniz, Stackify Blog, SmartBear Blog

Related Topics: Machine Learning , Java IoT, Industrial IoT, Microservices Expo, Microsoft Cloud, Agile Computing

Machine Learning : Article

Analyzing Webpage Performance with AJAX Edition 4

What makes older versions of IE so slow as compared to newer versions of Firefox?

It's been a while since we released the last major version of Compuware dynaTrace AJAX Edition. With AJAX Edition 4 we introduce the capability to test across all versions of Internet Explorer (IE) starting with IE6 and all versions of Firefox starting with 3.6.

Why is this important? Well, check out the test results of several pages we tested on IE6, 7 and 8 and contrast them with tests of the same pages using Firefox 16 and 18. A product page on Zappos.com loads in 1.3 seconds in Firefox 18 as compared to 5.6 seconds in IE6. That is four times slower on IE's rather ancient browser. Despite a concerted effort by the industry to get people to use updated browsers (including this one by Microsoft), we're still seeing a big mix in the browser versions people use to access websites. That means it's important to analyze webpage performance across browser versions to ensure your site functions and performs as it's supposed to.

In this article I want to show you how to do it and what the typical differences in performance are.

Step 1: Download Free Compuware dynaTrace AJAX Edition
Go to the AJAX Edition webpage and click on the download link. Run the Windows installer and launch it from your Start menu. You will be prompted to register a new APM Community account; use your existing account or continue with a five-day registration-free period. After five days the product remains free to use but you need to register an account. Registering a community account gives you full access to the discussion forum on the Compuware APM Community Portal where you can network with AJAX Edition peers and Compuware application performance experts to learn best practices, post questions and find troubleshooting tips.

Step 2: Capture Data Across Multiple Browsers
Now we are ready to start capturing performance data.

Click on "Click here to start tracing" and select either IE or Firefox. As you will be testing a web page you will be prompted for a name and a URL that you assign to that name, e.g., Zappos and zappos.com. Click "Run" and AJAX Edition will launch your browser and navigate right to that URL.

The AJAX Edition toolbar in IE and Firefox (here it's a status bar) indicates that the browser is connected to AJAX Edition and capturing all performance-relevant data while the browser is connected.

Walk through a use case on the page that you are testing, e.g., navigate through the menus, do a search, put items in your shopping cart or try out the social plugins. AJAX Edition will automatically capture all Network Roundtrips, JavaScript Executions, Rendering Activity and AJAX Requests for later performance analysis.

You may need to modify your browser's settings for this step to work properly. Check out our tips page for more information.

Step 3: Analyze High-level KPIs
I recorded several steps on zappos.com with different browsers. I used IE6, 7, 8 and Firefox 16 and 18. As I don't have all these browsers installed on my local machine I used different machines with AJAX Edition installed locally. After recording my sessions I exported the data into a dtas file and imported it all into my local AJAX Edition instance for analysis. This is also a typical use case in test departments where tests are done on different machines with different configurations. A performance expert receives these sessions for analysis and comparison.

All sessions are now available for analysis. Double-clicking a session opens the Performance Report showing high-level KPIs for each URL visited.

If you want to know the details about how these KPIs are calculated you can read up on them on our Best Practices on Web Performance Optimization community page.

When I checked zappos.com I saw a huge difference in page load time. Sure, I had expected this, but now I can quantify exactly what the difference is, and how different the experience of using the site is for people accessing it on different browsers. The majority of the time turned out to be spent in JavaScript, which took significantly longer on older browsers such as IE 6, IE 7 and Firefox 16.

Check out the following table that shows the key metrics across the different browsers for one of the product pages. The Fully Loaded time is the important metric to look for and the Client Time (Java Script Time) is the one metric with the biggest contribution to that Fully Loaded time:

IE 8 and Firefox 18 are about four times faster in Fully Loaded Time as compared to IE 6, which spends a large amount of time in JavaScript execution.

When looking at the Timeline View of the fastest (IE8) and the slowest (IE6) browsers, it is easy to spot where the differences are during page load:

The long-running JavaScript blocks in IE6 cause the majority of the page load difference compared to its "younger brother," IE 8

It shows how much performance impact JavaScript running on an older browser has on page load time. If supporting older browsers is still a priority for your business you'd better test and optimize for it.

Step 4: Deep-dive Analysis
The AJAX Edition doesn't just leave us with a nice timeline view but also allows us to drill into the JavaScript executions that take so long. Double-clicking on these long-running JavaScript blocks opens the JavaScript PurePath Dashlet that allows us to navigate through the exact JavaScript execution. The following screenshot shows the PurePath dashlet with the highlights on the long-running JavaScript methods. Seems like the problem is related to encoding and decoding long strings that are extraordinarily slow on IE6:

The decode and encode methods are the major contributors to the slow JavaScript execution. The AJAX Edition highlights these methods and also shows the actual source code responsible for it.

Besides going deep into JavaScript, AJAX Edition also provides deep insight into XHR (AJAX) Calls and how these calls impact page performance. Another unique aspect is analysis options for Rendering and Layout activities such as CSS Evaluations, Layouting and Drawing.

If you want to learn more about the deep-five diagnostics options I recommend, check out the online video tutorials on the specific views: AJAX Edition Tutorials.

Step 5: Compare Against Your Competition
Optimizing your site to work well on different browsers is great, but what if you are still much slower than your competition? AJAX Edition has built-in integration with Speed of the Web, which allows you to compare your KPIs against other websites in your industry. Once you have registered a community account and activated your copy of AJAX Edition you can select a category on the first tab in the Performance Report. Your KPIs will then be compared against the latest tests done by Speed of the Web.

On Speed of the Web you can select a category and see how your web performance optimization efforts compare to your competition.

Speed of the Web not only provides the KPIs of the top sites in different industries, it also allows you to test your own site using the same testing infrastructure as used to compute these values used in the comparison. Go to the SpeedoftheWeb.org and enter your URL. Not only will you get an online result of a tested URL you've entered, you will also get an AJAX Edition Session for download as Speed of the Web uses AJAX Edition to run these tests.

Step 6: Go Beyond Your Browser
Not all performance problems can be fixed by optimizing your JavaScript code, using sprites or enabling proper caching. You may also want to automate most of this testing instead of manually analyzing all this data for every build. If you are interested in how to automate performance analysis as well as getting insight into server-side performance problems, check out some of our other blogs such as Top Performance Problems from Zappos, Monster and Co as well as Next Generation Web Performance Optimization.

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

Comments (0)

Share your thoughts on this story.

Add your comment
You must be signed in to add a comment. Sign-in | Register

In accordance with our Comment Policy, we encourage comments that are on topic, relevant and to-the-point. We will remove comments that include profanity, personal attacks, racial slurs, threats of violence, or other inappropriate material that violates our Terms and Conditions, and will block users who make repeated violations. We ask all readers to expect diversity of opinion and to treat one another with dignity and respect.


@ThingsExpo Stories
SYS-CON Events announced today that Daiya Industry will exhibit at the Japan External Trade Organization (JETRO) Pavilion at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Daiya Industry specializes in orthotic support systems and assistive devices with pneumatic artificial muscles in order to contribute to an extended healthy life expectancy. For more information, please visit https://www.daiyak...
SYS-CON Events announced today that Nihon Micron will exhibit at the Japan External Trade Organization (JETRO) Pavilion at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Nihon Micron Co., Ltd. strives for technological innovation to establish high-density, high-precision processing technology for providing printed circuit board and metal mount RFID tags used for communication devices. For more inf...
SYS-CON Events announced today that Massive Networks, that helps your business operate seamlessly with fast, reliable, and secure internet and network solutions, has been named "Exhibitor" of SYS-CON's 21st International Cloud Expo ®, which will take place on Oct 31 - Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. As a premier telecommunications provider, Massive Networks is headquartered out of Louisville, Colorado. With years of experience under their belt, their team of...
SYS-CON Events announced today that Suzuki Inc. will exhibit at the Japan External Trade Organization (JETRO) Pavilion at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Suzuki Inc. is a semiconductor-related business, including sales of consuming parts, parts repair, and maintenance for semiconductor manufacturing machines, etc. It is also a health care business providing experimental research for...
SYS-CON Events announced today that mruby Forum will exhibit at the Japan External Trade Organization (JETRO) Pavilion at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. mruby is the lightweight implementation of the Ruby language. We introduce mruby and the mruby IoT framework that enhances development productivity. For more information, visit http://forum.mruby.org/.
Elon Musk is among the notable industry figures who worries about the power of AI to destroy rather than help society. Mark Zuckerberg, on the other hand, embraces all that is going on. AI is most powerful when deployed across the vast networks being built for Internets of Things in the manufacturing, transportation and logistics, retail, healthcare, government and other sectors. Is AI transforming IoT for the good or the bad? Do we need to worry about its potential destructive power? Or will we...
SYS-CON Events announced today that B2Cloud will exhibit at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. B2Cloud specializes in IoT devices for preventive and predictive maintenance in any kind of equipment retrieving data like Energy consumption, working time, temperature, humidity, pressure, etc.
In his session at @ThingsExpo, Greg Gorman is the Director, IoT Developer Ecosystem, Watson IoT, will provide a short tutorial on Node-RED, a Node.js-based programming tool for wiring together hardware devices, APIs and online services in new and interesting ways. It provides a browser-based editor that makes it easy to wire together flows using a wide range of nodes in the palette that can be deployed to its runtime in a single-click. There is a large library of contributed nodes that help so...
What is the best strategy for selecting the right offshore company for your business? In his session at 21st Cloud Expo, Alan Winters, U.S. Head of Business Development at MobiDev, will discuss the things to look for - positive and negative - in evaluating your options. He will also discuss how to maximize productivity with your offshore developers. Before you start your search, clearly understand your business needs and how that impacts software choices.
SYS-CON Events announced today that SIGMA Corporation will exhibit at the Japan External Trade Organization (JETRO) Pavilion at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. uLaser flow inspection device from the Japanese top share to Global Standard! Then, make the best use of data to flip to next page. For more information, visit http://www.sigma-k.co.jp/en/.
SYS-CON Events announced today that NetApp has been named “Bronze Sponsor” of SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. NetApp is the data authority for hybrid cloud. NetApp provides a full range of hybrid cloud data services that simplify management of applications and data across cloud and on-premises environments to accelerate digital transformation. Together with their partners, NetApp em...
Agile has finally jumped the technology shark, expanding outside the software world. Enterprises are now increasingly adopting Agile practices across their organizations in order to successfully navigate the disruptive waters that threaten to drown them. In our quest for establishing change as a core competency in our organizations, this business-centric notion of Agile is an essential component of Agile Digital Transformation. In the years since the publication of the Agile Manifesto, the conn...
There is huge complexity in implementing a successful digital business that requires efficient on-premise and cloud back-end infrastructure, IT and Internet of Things (IoT) data, analytics, Machine Learning, Artificial Intelligence (AI) and Digital Applications. In the data center alone, there are physical and virtual infrastructures, multiple operating systems, multiple applications and new and emerging business and technological paradigms such as cloud computing and XaaS. And then there are pe...
Real IoT production deployments running at scale are collecting sensor data from hundreds / thousands / millions of devices. The goal is to take business-critical actions on the real-time data and find insights from stored datasets. In his session at @ThingsExpo, John Walicki, Watson IoT Developer Advocate at IBM Cloud, will provide a fast-paced developer journey that follows the IoT sensor data from generation, to edge gateway, to edge analytics, to encryption, to the IBM Bluemix cloud, to Wa...
SYS-CON Events announced today that MIRAI Inc. will exhibit at the Japan External Trade Organization (JETRO) Pavilion at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. MIRAI Inc. are IT consultants from the public sector whose mission is to solve social issues by technology and innovation and to create a meaningful future for people.
While some developers care passionately about how data centers and clouds are architected, for most, it is only the end result that matters. To the majority of companies, technology exists to solve a business problem, and only delivers value when it is solving that problem. 2017 brings the mainstream adoption of containers for production workloads. In his session at 21st Cloud Expo, Ben McCormack, VP of Operations at Evernote, will discuss how data centers of the future will be managed, how th...
SYS-CON Events announced today that Keisoku Research Consultant Co. will exhibit at the Japan External Trade Organization (JETRO) Pavilion at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Keisoku Research Consultant, Co. offers research and consulting in a wide range of civil engineering-related fields from information construction to preservation of cultural properties. For more information, vi...
SYS-CON Events announced today that Fusic will exhibit at the Japan External Trade Organization (JETRO) Pavilion at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Fusic Co. provides mocks as virtual IoT devices. You can customize mocks, and get any amount of data at any time in your test. For more information, visit https://fusic.co.jp/english/.
SYS-CON Events announced today that Enroute Lab will exhibit at the Japan External Trade Organization (JETRO) Pavilion at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Enroute Lab is an industrial design, research and development company of unmanned robotic vehicle system. For more information, please visit http://elab.co.jp/.
SYS-CON Events announced today that Mobile Create USA will exhibit at the Japan External Trade Organization (JETRO) Pavilion at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Mobile Create USA Inc. is an MVNO-based business model that uses portable communication devices and cellular-based infrastructure in the development, sales, operation and mobile communications systems incorporating GPS capabi...