Optimize WordPress Web site Efficiency The usage of Prolong JavaScript Execution

by | Jun 27, 2023 | Etcetera | 0 comments

Looking for techniques to further optimize your WordPress internet web page’s potency? Easy…switch on Hummingbird‘s new Extend JavaScript Execution function!

Most internet sites this present day are weighted down with JavaScript files and inline scripts, which will also be helpful useful resource extensive and impact internet web page potency and PageSpeed rankings in areas like internet web page rendering and load time.

As you’ll learn in this article, delaying the execution of JavaScript files to prioritise the load of additional severe portions first can keep the entire load time of your internet web page in take a look at and fortify your PageSpeed ratings.

Even upper, we’ll show you automate all the process with just one click on on using our WordPress optimization plugin, Hummingbird.

In this article, we’ll take a look at:

Let’s bounce correct in…

Why Delaying JavaScript Execution Helps To Optimize Internet web page Potency

As mentioned earlier, internet sites this present day are loaded with 3rd-party scripts for serving commercials, tracking engagement, protection verification, and plenty of others., which is in a position to block pages from rendering in short on shoppers’ browsers and impact your internet web page’s client revel in and search engine rankings.

Protecting the ones scripts off from loading in your internet web page until there’s exact client interaction with the internet web page can significantly fortify areas of your internet web page’s potency like:

1. Sooner Internet web page Loading Events

Via delaying the execution of JavaScript files until shoppers engage with the internet web page, web pages will load quicker, allowing shoppers to get right to use and engage with the internet web page additional in short. That is serving to fortify client revel in and increase client engagement.

2. Improved Rendering Potency

Browser rendering engines wish to process JavaScript previous to they may be able to display the internet web page content material subject material. Delaying JavaScript execution until after shoppers engage the internet web page content material subject material has been loaded helps the browser render the internet web page additional in short and effectively. This means shoppers can see and engage with the web internet web page sooner.

3. Reduced HTTP Requests

Combining JavaScript files and loading them asynchronously can reduce the number of HTTP requests made to the server, which moreover helps to speed up internet web page loading events.

4. Upper Google PageSpeed Insights Ranking

Google considers internet web page speed as a ranking factor for search results, and delaying JavaScript execution can fortify your internet web page’s PageSpeed Insights score, almost certainly major to better search engine rankings.

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5. Lower Server Load

Via loading JavaScript asynchronously and combining files, fewer requests are made to the server, lowering its workload, and helping to stop server crashes or slow responses in every single place high-traffic situations.

Making improvements to PageSpeed Ranking Ideas

PageSpeed Insights score
Want to fortify your PageSpeed Insights score? Take a look at delaying JavaScript record execution.

Delaying JavaScript execution in your internet web page can fortify your Google PageSpeed score by the use of addressing the following tips:

Remove unused JavaScript

This recommendation suggests eliminating unused or needless JavaScript code from your web pages. Unused JavaScript can increase your internet web page’s load time, for the reason that browser has to acquire, parse, and execute the code despite the fact that it’s now not being used.

Via putting off any unused JavaScript code, you’ll decrease the record size and fortify your internet web page’s common potency.

Common blockading time

Common blockading time is a metric that measures the time period between the First Contentful Paint (FCP) and the Time to Interactive (TTI) in every single place which the principle thread used to be as soon as blocked for long enough to stop input responsiveness.

In simple words, it quantifies the length when the internet web page becomes unresponsive on account of processing heavy JavaScript tasks. Lowering all the blockading time makes your internet web page additional responsive and improves client revel in.

Scale back main thread artwork

The main thread is answerable for executing JavaScript, style calculations, layout, and other tasks required to turn a web internet web page. Minimizing main thread artwork refers to the approach of optimizing the code and lowering the time the principle thread spends on heavy tasks. This will also be completed by the use of putting off needless JavaScript, splitting long tasks into smaller chunks, and optimizing the code’s execution.

A lighter workload on the main thread results in quicker internet web page loading, stepped ahead rendering, and enhanced client revel in.

Time to interactive (TTI)

This potency metric measures the time it takes for a web internet web page to turn out to be utterly interactive and responsive to client input. A internet web page is considered interactive when the principle thread is loose from heavy tasks, and shoppers will have interplay with the elements on the computer screen, similar to clicking buttons or scrolling.

Making improvements to the TTI by the use of optimizing JavaScript, splitting large tasks, and lowering render-blocking assets promises a better client revel in by the use of allowing shoppers to interact with the internet web page additional in short.

Reduce JS execution time

Reducing JavaScript execution time involves optimizing the code to execute quicker and use fewer assets. This will also be finished through techniques similar to code minification, putting off unused JavaScript, and optimizing algorithms.

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Reducing the execution time leads to quicker rendering, diminished common blockading time, and better responsiveness, providing a better client revel in.

First Contentful Paint (FCP)

This is a potency metric that measures the time it takes for the browser to render the principle visible part (text, image, or other content material subject material) of a web internet web page. A quicker FCP equates to a quicker initial internet web page load, providing shoppers with a visual feedback that the internet web page is loading. Making improvements to FCP requires optimizing severe rendering paths, delaying non-critical JavaScript execution, and prioritizing the loading of visible content material subject material.

A quicker FCP significantly contributes to a better client revel in and stepped ahead web internet web page potency.

Delaying JavaScript Execution Methods

While quicker internet web page load events, lowered render-blocking, and prioritized content material subject material loading provide many benefits to shoppers and can send higher PageSpeed ratings, the actual methods available for delaying JavaScript execution on WordPress internet sites will also be tricky for purchasers without technical knowledge or web optimization talents.

As an example, the ones methods can include:

  • Enforce async or defer attributes: This calls so that you can manually add async or defer attributes for your JavaScript files throughout the HTML header, which tells the browser not to block the internet web page rendering while processing the JavaScript files.
  • Combine JavaScript files: Use online equipment or WordPress plugins to combine a few JavaScript files proper right into a single record, helping to reduce the number of HTTP requests and boost up internet web page loading events.
  • Minify JavaScript files: Use online equipment or WordPress plugins to reduce JavaScript record size, which helps to fortify internet web page loading events.
  • Prioritize severe JavaScript: Identify the intense JavaScript that should be loaded straight away to ensure correct capacity, and then load the rest JavaScript files after the internet web page content material subject material has been rendered.

While there are a few WordPress plugins available that can take care of a couple of of those tasks for you and will let you to elongate or defer JavaScript execution, our Hummingbird plugin does all the above and additional with the press of a button.

Use Hummingbird’s Extend JavaScript Execution Serve as

The new optimization function of Hummingbird delays the loading of all JavaScript files and inline scripts until there’s client interaction on the internet web page (e.g. mouse movement, keyboard movement or computer screen tap) and improves all the PageSpeed tips described earlier.

To allow this selection, make certain that Hummingbird is installed and activated in your internet web page, then navigate to Hummingbird > Asset Optimization > Additional Optimization in your WordPress admin and switch on the Allow Extend Javascript toggle button throughout the Apparatus > Extend Javascript section, then click on on Save Changes.

Hummingbird's Delay JavaScript feature.
Allow Hummingbird’s Extend JavaScript function to fortify your internet web page’s potency.

Alternatively, you’ll allow the function from the plugin’s main dashboard.

Hummingbird dashboard: Asset Optimization - Delay JavaScript Execution
Allow Extend JavaScript Execution from Hummingbird’s dashboard.

As quickly because the Extend JavaScript Execution function has been enabled, it automatically goes to artwork, delaying the loading of any non-critical JavaScript files in your internet web page that don’t appear to be required above-the-fold.

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The function’s settings get a hold of get right to use to possible choices like being able to specify a timeout for the scripts to load if no client interaction is detected, and how you can exclude severe JavaScript files from from being at the back of time table on load by the use of specifying their URLs or keywords.

Hummingbird's Delay JavaScript settings
Hummingbird delays the loading of JavaScript files until a set timeout restrict is reached or a shopper interacts with the internet web page.

If enabling this selection breaks something in your internet web page and in addition you identify additional severe Javascript assets which can also be essential to render the internet web page, simply add them to the Excluded JavaScript Files space to exclude them from being at the back of time table.

If there’s no client interaction on the internet web page previous a set threshold, the JavaScript assets are burdened to load. The default timeout is able to twenty seconds, then again you’ll make a selection a unique value from the Timeout dropdown menu (not too long ago ranging between 5-30 seconds).

Hummingbird's Delay JavaScript Timeout options
Make a selection a timeout chance from the dropdown menu.


  • Enabling JavaScript Execution will automatically disable the Combine Compression option to make certain that your internet web page’s scripts are loaded in their correct order.
  • The function will easiest artwork when you’re connected to The Hub, as it pulls the tick list of steadily up-to-the-minute predefined exclusions from the API.
  • You’ll have the ability to merely reverse any changes made by the use of this selection by the use of simply disabling the toggle and clicking save.

Extend JavaScript and Tempo Up WordPress

Hummingbird’s Extend JavaScript function is available in every the Professional and unfastened diversifications of the plugin. We suggest enabling this selection and testing your internet web page using the PageSpeed Insights device.

If you happen to revel in any issues using Hummingbird, check out the plugin’s documentation or contact our 24/7 reinforce workforce for fast skilled reinforce.

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