How Lazy Loading Images Can Speed Up Your Site

lazy loading

Updated June 25, 2019


Lazy loading images is a technique to greatly speed up website loading times by only loading what’s immediately visible, saving other images below the scroll for loading later, as the person scrolls down.  Done correctly, web visitors would never notice this lazy loading was happening.  They would notice pages load much quicker – improving satisfaction with your site.


Nothing annoys a web user more than a site that takes forever to load. By forever, we mean three seconds or more. Research shows that the rise of devices in the digital age has resulted in the decline in human attention span, which is now less than the ill-focused goldfish.


What this means for you is that you cannot afford a second of delay in load times. Users tend to care more about speed than aesthetic design, nifty functionality, and other things people add to websites. So, generally, your goal should be to deliver a user-friendly experience that leaves users feeling nice about visiting your site – and load times contributed to that.


Load time is a significant contributing factor to page abandonment – the average visitor has no patience for a page that takes more than three seconds to load. However, with large payloads and many requests, it may be impossible to achieve this level of speed. In fact, research by Google revealed that an average mobile landing page takes 22 seconds to load fully. This can be discouraging, considering 53% of people leave a mobile page if it takes longer than three seconds to load.


There’s an effortless way to increase the load speed of your website by an amazing amount – a way to offload or even avoid loading page assets until they are required. This can give your site an edge over your peers because both search engines and your users will like your pages better.


rocket fast


Lazy Loading Explained


Lazy loading (or on-demand loading) is the practice of delaying initialization or load of objects or resources until they are actually needed to save system resources and improve performance. For instance, if a web page has an image that the visitor has to scroll down to view, you can put a placeholder and lazy load the whole picture only when the visitor gets to the browser’s viewpoint. So basically, on-demand loading helps in loading only the needed section and delays the other parts, until the user needs to use them.


You’ve probably seen lazy loading in action on platforms like Medium, Pinterest, or Facebook and it goes something like this:

1) You click on a page and scroll down through the content

2) When you get to an image, you see a blurry image that acts as the placeholder

3) But once the image gets to the browser’s viewpoint, the blurry image gets swapped with the actual image immediately


Using Lazy Loading On Your Blog


Implementing lazy loading of images on a WordPress site is a breeze.  Simply install the Lazy Load by WP Rocket plugin from the WordPress repository, activate and away you go.


The lazy loading plugin will automatically handle all the behind the scenes, swapping images in as necessary, and slashing your page load times.


Lazy Savings


Images play a critical role in websites. A study by HTTP Archive revealed that photos make more than 60% of data loaded on web pages. Considering their role in sites – whether its fashion, news, e-commerce, blog or travel website – image optimization is essential, and maybe the lowest hanging fruit when seeking for ways to speed up your image-packed platform. Among the different ways of speeding up a site, loading fewer resources offer the easiest and fastest way to get incredible results.




Optimizes Response Time


Response time is the amount of time it takes the UI interface to be responsive to visitors and the website application to load. Lazy loading boosts the response time by splitting into multiple bundles and loading them when desired.


Minimizes Resource Consumption


Slow load times cause frustration for site users because people are used to having web pages load in three or fewer seconds. Research shows that more than 53% of mobile users will give up beyond the three second mark. But thanks to lazy loading, you can reduce the page time because it reduces the number of resources loading, and only loads the code bundle that’s required at a time.


When you send the user code that’s not needed, you not only waste the resources from your end but from the user’s end as well. Besides, you will need more bandwidth to move the data, more CPU to analyze and process them, and more memory to store the data. These assets consume resources from other crucial assets that require it urgently, consequently slowing up a site.


If you think about it, what’s the point of loading resources that the visitor won’t need, like images they won’t scroll down to?




Using lazy loading of images is a technique, like image compression, that lets you speed up the performance of your website without spending more on hardware, software, or administrative time.  Lazy loading is an approach that you can put in place which will speed up every page of the site.


Improve your website loading speed, enjoy better search rankings, love the enhanced user engagement (user experience) – and let that help fuel improved website conversions and profitability.  Minimum effort, maximum gain.



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