Lazy vs. Eager: Which Data Loading Strategy Should You Use
Lazy Load

Lazy vs. Eager: Which Data Loading Strategy Should You Use

2 min read

A lot is riding on your website's performance. Read this blog to know more about the two data loading strategies that you can choose from.

Sayali Saswadkar
Sayali Saswadkar

15 June 2021

No matter how stunning your website looks, if it doesn't load fast, you’re going to lose visitors. It’s because users expect a web page to load in a few seconds, whether they view it on their smartphones or laptops.

But why does a site get so slow? It’s because the site’s data such as video or images might have large file sizes, which takes too long to load. Thus, it’s important to optimize the website’s data loading process to retain traffic.

Today, we’ll talk about two data loading strategies: lazy vs eager loading, which affect a site’s performance.

What is Lazy Loading?

Lazy loading or on-demand loading is an optimization method in web and application development for website content or online content. The process doesn’t load all the site content at first and only loads the vital ones.

Lazy loading improves a website’s performance by loading the required content first and delaying the rest of the page content. The remaining content is loaded only when the user needs it. The browser loads only a portion of the content which the user requires. As a result, the time taken to load the website is reduced.

What is Eager Loading?

As the name might suggest, this is the opposite of the lazy loading process. In eager loading, the browser will load all the images and other content of the site at once. The browser will store all the content in its cache. However, websites having large content files tend to load slower with this method.

Pages with fewer images and more textual content use eager loading. For example, Wikipedia pages use eager loading as their pages mainly consist of text and lesser images.

When To Use Eager And Lazy Loading?

Now that you’ve wrapped your head around the basics of lazy vs eager loading, let’s see their uses.

Eager Loading For Reducing Queries

Eager loading ensures that a website and its associated assets load at once. If a site contains lightweight assets, eager loading loads all assets together without running additional SQL queries. It not only reduces the number of queries but also saves time.

Lazy Loading For System Conservation

Lazy loading helps in system resource conservation by preserving the client and server’s resources. It’s because it loads only some of the website’s images, videos, and JavaScript code, and not all of it at a time. This process also conserves bandwidth and increases page load speed.

You can use Gumlet, a fantastic online tool, which will automatically lazy load your website content for you.

Summing It Up

We hope our post has helped you understand lazy vs eager loading and how they affect your site’s speed. As a rule of thumb, you can use lazy loading for content-heavy sites. Moreover, you can also optimize the webpage images using Gumlet. For sites consisting of mostly textual content, eager loading is the best approach.

Related Readings

Guide on Lazy Load Images

Guide on Lazy Load Images

Deep dive into the concept of lazy load images, the importance of this technique, and how you can make the best out of it with this blog.

20 Aug 2021 - 9 min read