What is progressive rendering?

introduce

Have you measured the loading speed of your website? If no, there are many tools available on the internet to test website speed. Find anyone and measure it. According to Google, if your website loads faster than 3 seconds, it means you’re losing a total of 32% of your visitors.

So it helps if you take steps to slow down the loading speed of your website, which is where progressive rendering comes in, which allows developers to increase the loading speed of their website.

What is progressive rendering?

Before discussing progressive rendering technology, let us first understand the term progressive rendering. So, progressive means showing up step by step like normal progress, which you might have seen when downloading or uploading files, or even updating apps on your phone.

The meaning of rendering is to display content on the web page. So the full meaning of the term progressive rendering is to display different components of a web page one by one instead of displaying the entire content at once.

This is the definition of progressive rendering.

Progressive Rendering is a technique in which web developers break the code of a web page into smaller, more manageable chunks and display all the chunks one by one to improve the performance of the web page.

How does progressive rendering work?

Now, let’s understand how progressive rendering works.

If we render a normal web page on the browser, it will load all the content of the web page together, including HTML, CSS and JavaScript. But in progressive rendering, developers need to break the code into smaller parts for progressive rendering, as mentioned in the previous section.

In the first part of rendering, the website should load components such as the header, body background, or the main tricky parts of the web page. After that, the website should start loading CSS to style the components. This way visitors can start interacting with the web page.

After that, we need to load a remaining HTML component and add behavior to the code using CSS and JavaScript. Additionally, we should load JavaScript asynchronously.

Whenever we need to display an image or anything after downloading or getting data from API, it should be displayed at the end.

Different technologies to achieve progressive rendering

Now, we will learn different ways to implement progressive rendering on your website.

Lazy loading

As the name suggests, it delays loading of web content. In lazy loading technology, we load web content only when needed. For example, you must display 100 images on a single web page; initially, the user can only see 10 images, and the user will need to scroll to see the other images. In this case, we can load the first 10 images and other images first as the user scrolls the web page.

In this way, we can use lazy loading technology to improve web page performance.

Prioritize web content

Another approach to progressive rendering is by loading the content you need first. For example, when loading a web page, we can display the content of the interactive part first, and then load other content.

Additionally, we can initially render only the required CSS. For example, we need to get data from API and then we need to render the data. So if we render all CSS together, it will also render CSS without data, which we can render after getting the data.

So, in this way, we can display content with high priority first, and then other content on the page.

Why should developers use progressive rendering?

We explain some of the advantages of progressive rendering here.

Fast web page loading

The main benefit of progressive rendering is that it increases the speed of web pages. It loads the content of a web page in chunks so that users can start interacting with the web page as soon as they open it.

Improve user experience

As progressive rendering increases website loading speed, users can interact with the website more. It also increases the number of visitors to the website.

Improve your website’s search engine optimization

In SEO, web page speed is one of the important characteristics. Google’s crawler robots crawl every page and evaluate the website’s content. If the loading speed is slow, the crawler bot will skip the page and if the page speed is less than 1 second, it will rank the website among competitors.

in conclusion

Progressive rendering is a technology that improves the performance of web pages by rendering their HTML, CSS, and JavaScript content in smaller chunks or when needed. We also discussed two ways to implement progressive rendering and the benefits of using progressive rendering.

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