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WebPerf 101: #JavaScript | @CloudExpo #Catchpoint #DevOps #CD #WebPerf

Today, almost every website uses JavaScript to provide an interactive digital experience

Web Performance 101: Optimizing JavaScript
By Kameerath Kareem

JavaScript redefined web applications ushering in a new era of dynamic websites with fluid responsive designs. It has gained a strong following among developers, popular libraries and frameworks like JQuery and Angular JS are all built with JavaScript. The endless design possibilities that JavaScript provides coupled with the numerous libraries available today makes it an indispensable part of web application development.

Why JavaScript?
Today, almost every website uses JavaScript to provide an interactive digital experience. JavaScript made it possible to refresh/load sections of the page without having to reload the entire page every time the user clicks on a button or submits a form. Since scripts can manipulate DOM elements, it gave the developers more flexibility in designing and coding applications. This also led to development of widgets and plugins that could be easily integrated with web applications using simple JavaScript.

Best Practices
As more and more applications implemented JavaScript, it was evident that the advantages of using the scripting language came at the cost of performance. Scripts can impact digital experience significantly – if a script takes too long to download or execute then it can add to the load time of the webpage; if a script encounters an error or is not coded properly then the page may not render at all. So, if you are using JavaScript on your website then it is important to ensure that it works seamlessly with your website. Let us look at some of the best practices to be followed when using JavaScript in your website.

1.Minify and combine JS files
Minifying JS files will remove unwanted characters (whitespace, tab etc.) and comments from the script. This will help compress the file making it smaller in size. The files will download comparatively faster as it is minified and hence lighter. There are several tools available online to help minify JavaScript like Google’s Closure Compiler, JsMin, and UglifyJS.

jsminify

It is also recommended to combine multiple JS files so the file can be downloaded over a single connection reducing server overhead – the browser will be able to download a 50 KB file faster over a single connection instead of downloading 10 separate files of 5 KB each from multiple connections.

jscombine

2. Avoid Duplicate and Inline scripts
Adding lines and lines of JS code to the page HTML will add to the total page size and unlike CSS, script and image files, HTML is not frequently cached by the browser; any inline script will be downloaded and parsed on every page load. Hence, it is recommended to place the JS code in an external file, this will allow the browser to cache the files cutting down the time taken to download and execute the required script.

There are many JS libraries and frameworks available; each of these are regularly updated resulting in multiple versions. Developers may embed different versions of the same JS script or add the same script more than once, this can cause errors on the page and may even block the page from rendering properly. In addition to this, Duplicate script tags also add to the page overhead.

When using JQuery or other JavaScript libraries/modules, it is important to use the latest version and avoid embedding duplicate script tags in the same page. This will ensure there are no errors and conflicts during code execution.

3. Event Handlers
JS allows developers to add custom handlers and manipulate page elements to provide a more responsive and interactive web application. But when numerous event handlers are fired it can result in performance degradation.

figure_3_event

To prevent event handlers from using up browser resources, you must keep track of the number of event handlers being triggered along with unbind event handler when not in use.

4. Reduce DOM manipulation
DOM manipulation is used to make web applications responsive but this results in re-rendering the HTML elements on the page; this process is called a Reflow. Reflow time can add up with every DOM manipulation and this can have an impact on the digital experience.

If you must use Javascript to edit DOM elements, then consider the DOM structure while coding the script to keep it concise and efficient. Remove unwanted <divs> and <spans> from the HTML and reduce the DOM “depth” so there are fewer node levels to traverse. Animations and style edits to the HTML must be done using CSS and not JavaScript this will greatly minimize interaction with DOM elements.

5. Using Async and Defer
Parallel downloads can be blocked by scripts, if there are multiple scripts on a page then each of the scripts will be downloaded sequentially. This means the page will not render till all the scripts have been downloaded and processed. Javascript provides different techniques to avoid render-blocking.

    • Async – Loading the script asynchronously allows the rest of the webpage or application to execute while the script is downloaded in the background. The script is then executed once download is completed.
    • Defer – Using defer, the script can be forced to load/execute only after the page has completed loading and this ensures the script is not render-blocking.

async-vs-defer-twitter

The Future
JavaScript has evolved into a powerful language. The functionality it offers along with the ease with which it can be implemented in web application makes it among the most widely used scripting language. From websites, mobile application to the “Internet of Things”(IoT), JavaScript continues to be the preferred language among developers.

The post Web Performance 101: Optimizing Javascript appeared first on Catchpoint's Blog.

Internet of @ThingsExpo, taking place June 6-8, 2017at Javits Center, New York City, is co-located with the 20th International @CloudExpo and will feature technical sessions from a rock star conference faculty and the leading industry players in the world. @ThingsExpo New York Call for Papers is now open.

@CloudExpo / @ThingsExpo 2017 New York 
(June 6-8, 2017, Javits Center, Manhattan)

@CloudExpo / @ThingsExpo 2017 Silicon Valley
(October 31 - November 2, 2017, Santa Clara Convention Center, CA)

The Internet of Things (IoT) is the most profound change in personal and enterprise IT since the creation of the Worldwide Web more than 20 years ago.

All major researchers estimate there will be tens of billions devices - computers, smartphones, tablets, and sensors - connected to the Internet by 2020. This number will continue to grow at a rapid pace for the next several decades.

Speaking Proposals ▸ Here

@ThingsExpo New York will present a total of 14 distinct IoT tracks including:

  • 5G Networks and IoT
  • Artificial Intelligence
  • Big Data and IoT Data Analytics
  • Blockchain
  • Cloud Computing and IoT
  • Consumer IoT
  • Deep Learning
  • Digital Transformation
  • Financial Technology
  • Fog Computing and IoT
  • Green IoT
  • Healthcare
  • Identification and Authentication Issues
  • Industrial IoT
  • IoT and Agriculture
  • IoT and Security
  • IoT Development & Deployment
  • IoT Mining and Analytics
  • IoT Protocols
  • Machine Learning

Help plant your flag in the fast-expanding business opportunity that is the Internet of Things: submit your speaking proposal today!

Conference session topics will also include:

Speaking Proposals ▸ Here

  • Machine to Machine Communications and IoT
  • Mobility
  • Sensor and Actuator Networks
  • Smart Cars
  • Smart Cities, Smart Home/Building Automation
  • Smart Grid, Energy Management
  • Social Models and Networks
  • Software Defined Network (SDN) and IoT
  • Standardization and Regulation
  • Wearables
  • Web of Everything
  • Wireless Sensor Networks

The World's Largest "Cloud Digital Transformation" Event

@CloudExpo / @ThingsExpo 2017 New York 
(June 6-8, 2017, Javits Center, Manhattan)

@CloudExpo / @ThingsExpo 2017 Silicon Valley
(Oct. 31 - Nov. 2, 2017, Santa Clara Convention Center, CA)

Full Conference Registration Gold Pass and Exhibit Hall ▸ Here

Register For @CloudExpo ▸ Here via EventBrite

Register For @ThingsExpo ▸ Here via EventBrite

Register For @DevOpsSummit ▸ Here via EventBrite

Sponsorship Opportunities

Sponsors of Cloud Expo @ThingsExpo will benefit from unmatched branding, profile building and lead generation opportunities through:

  • Featured on-site presentation and ongoing on-demand webcast exposure to a captive audience of industry decision-makers
  • Showcase exhibition during our new extended dedicated expo hours
  • Breakout Session Priority scheduling for Sponsors that have been guaranteed a 35 minute technical session
  • Online targeted advertising in SYS-CON's i-Technology Publications
  • Capitalize on our Comprehensive Marketing efforts leading up to the show with print mailings, e-newsletters and extensive online media coverage
  • Unprecedented Marketing Coverage: Editorial Coverage on ITweetup to over 100,000 plus followers, press releases sent on major wire services to over 500 industry analysts

For more information on sponsorship, exhibit, and keynote opportunities, contact Carmen Gonzalez (@GonzalezCarmen) today by email at events (at) sys-con.com, or by phone 201 802-3021.

Secrets of Sponsors and Exhibitors ▸ Here
Secrets of Cloud Expo Speakers ▸ Here

All major researchers estimate there will be tens of billions devices - computers, smartphones, tablets, and sensors - connected to the Internet by 2020. This number will continue to grow at a rapid pace for the next several decades.

With major technology companies and startups seriously embracing Cloud strategies, now is the perfect time to attend @CloudExpo@ThingsExpo, June 6-8, 2017, at the Javits Center in New York City, NY and October 31 - November 2, 2017, Santa Clara Convention Center, CA. Learn what is going on, contribute to the discussions, and ensure that your enterprise is on the right path to Digital Transformation.

Track 1. FinTech
Track 2. Enterprise Cloud | Digital Transformation
Track 3. DevOps, Containers & Microservices 
Track 4. Big Data | Analytics
Track 5. Industrial IoT
Track 6. IoT Dev & Deploy | Mobility
Track 7. APIs | Cloud Security
Track 8. AI | ML | DL | Cognitive Computing

Delegates to Cloud Expo @ThingsExpo will be able to attend 8 simultaneous, information-packed education tracks.

There are over 120 breakout sessions in all, with Keynotes, General Sessions, and Power Panels adding to three days of incredibly rich presentations and content.

Join Cloud Expo @ThingsExpo conference chair Roger Strukhoff (@IoT2040), June 6-8, 2017, at the Javits Center in New York City, NY and October 31 - November 2, 2017, Santa Clara Convention Center, CA for three days of intense Enterprise Cloud and 'Digital Transformation' discussion and focus, including Big Data's indispensable role in IoT, Smart Grids and (IIoT) Industrial Internet of Things, Wearables and Consumer IoT, as well as (new) Digital Transformation in Vertical Markets.

Financial Technology - or FinTech - Is Now Part of the @CloudExpo Program!

Accordingly, attendees at the upcoming 20th Cloud Expo @ThingsExpo June 6-8, 2017, at the Javits Center in New York City, NY and October 31 - November 2, 2017, Santa Clara Convention Center, CA will find fresh new content in a new track called FinTech, which will incorporate machine learning, artificial intelligence, deep learning, and blockchain into one track.

Financial enterprises in New York City, London, Singapore, and other world financial capitals are embracing a new generation of smart, automated FinTech that eliminates many cumbersome, slow, and expensive intermediate processes from their businesses.

FinTech brings efficiency as well as the ability to deliver new services and a much improved customer experience throughout the global financial services industry. FinTech is a natural fit with cloud computing, as new services are quickly developed, deployed, and scaled on public, private, and hybrid clouds.

More than US$20 billion in venture capital is being invested in FinTech this year. @CloudExpo is pleased to bring you the latest FinTech developments as an integral part of our program, starting at the 20th International Cloud Expo June 6-8, 2017 in New York City and October 31 - November 2, 2017 in Silicon Valley.

@CloudExpo is accepting submissions for this new track, so please visit www.CloudComputingExpo.com for the latest information.

Speaking Opportunities

The upcoming 20th International @CloudExpo@ThingsExpo, June 6-8, 2017, at the Javits Center in New York City, NY and October 31 - November 2, 2017, Santa Clara Convention Center, CA announces that its Call For Papers for speaking opportunities is open.

Submit your speaking proposal today! ▸ Here

Our Top 100 Sponsors and the Leading "Digital Transformation" Companies

(ISC)2, 24Notion (Bronze Sponsor), 910Telecom, Accelertite (Gold Sponsor), Addteq, Adobe (Bronze Sponsor), Aeroybyte, Alert Logic, Anexia, AppNeta, Avere Systems, BMC Software (Silver Sponsor), Bsquare Corporation (Silver Sponsor), BZ Media (Media Sponsor), Catchpoint Systems (Silver Sponsor), CDS Global Cloud, Cemware, Chetu Inc., China Unicom, Cloud Raxak, CloudBerry (Media Sponsor), Cloudbric, Coalfire Systems, CollabNet, Inc. (Silver Sponsor), Column Technologies, Commvault (Bronze Sponsor), Connect2.me, ContentMX (Bronze Sponsor), CrowdReviews (Media Sponsor) CyberTrend (Media Sponsor), DataCenterDynamics (Media Sponsor), Delaplex, DICE (Bronze Sponsor), EastBanc Technologies, eCube Systems, Embotics, Enzu Inc., Ericsson (Gold Sponsor), FalconStor, Formation Data Systems, Fusion, Hanu Software, HGST, Inc. (Bronze Sponsor), Hitrons Solutions, IBM BlueBox, IBM Bluemix, IBM Cloud (Platinum Sponsor), IBM Cloud Data Services/Cloudant (Platinum Sponsor), IBM DevOps (Platinum Sponsor), iDevices, Industrial Internet of Things Consortium (Association Sponsor), Impinger Technologies, Interface Masters, Intel (Keynote Sponsor), Interoute (Bronze Sponsor), IQP Corporation, Isomorphic Software, Japan IoT Consortium, Kintone Corporation (Bronze Sponsor), LeaseWeb USA, LinearHub, MangoApps, MathFreeOn, Men & Mice, MobiDev, New Relic, Inc. (Bronze Sponsor), New York Times, Niagara Networks, Numerex, NVIDIA Corporation (AI Session Sponsor), Object Management Group (Association Sponsor), On The Avenue Marketing, Oracle MySQL, Peak10, Inc., Penta Security, Plasma Corporation, Pulzze Systems, Pythian (Bronze Sponsor), Cosmos, RackN, ReadyTalk (Silver Sponsor), Roma Software, Roundee.io, Secure Channels Inc., SD Times (Media Sponsor), SoftLayer (Platinum Sponsor), SoftNet Solutions, Solinea Inc., SpeedyCloud, SSLGURU LLC, StarNet, Stratoscale, Streamliner, SuperAdmins, TechTarget (Media Sponsor), TelecomReseller (Media Sponsor), Tintri (Welcome Reception Sponsor), TMCnet (Media Sponsor), Transparent Cloud Computing Consortium, Veeam, Venafi, Violin Memory, VAI Software, Zerto

About SYS-CON Media & Events
SYS-CON Media (www.sys-con.com) has since 1994 been connecting technology companies and customers through a comprehensive content stream - featuring over forty focused subject areas, from Cloud Computing to Web Security - interwoven with market-leading full-scale conferences produced by SYS-CON Events. The company's internationally recognized brands include among others Cloud Expo® (@CloudExpo), Big Data Expo® (@BigDataExpo), DevOps Summit (@DevOpsSummit), @ThingsExpo® (@ThingsExpo), Containers Expo (@ContainersExpo) and Microservices Expo (@MicroservicesE).

Cloud Expo®, Big Data Expo® and @ThingsExpo® are registered trademarks of Cloud Expo, Inc., a SYS-CON Events company.

More Stories By Mehdi Daoudi

Catchpoint radically transforms the way businesses manage, monitor, and test the performance of online applications. Truly understand and improve user experience with clear visibility into complex, distributed online systems.

Founded in 2008 by four DoubleClick / Google executives with a passion for speed, reliability and overall better online experiences, Catchpoint has now become the most innovative provider of web performance testing and monitoring solutions. We are a team with expertise in designing, building, operating, scaling and monitoring highly transactional Internet services used by thousands of companies and impacting the experience of millions of users. Catchpoint is funded by top-tier venture capital firm, Battery Ventures, which has invested in category leaders such as Akamai, Omniture (Adobe Systems), Optimizely, Tealium, BazaarVoice, Marketo and many more.

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