Rendering Issues: The Definitive Guide

Rendering Issues: The Definitive Guide

1. What is Render?

The web browser engines render web pages. They use the DOM (Document Object Model). HTML is a source to load the DOM. The concept is separating the data from the view and if you ever used web developer tools in a web browser you can see an “Elements Inspector” and other windows with information.

When a website loads in the browser, it sends out calls to each and every script in a queue. Usually, that queue needs to be empty before the website is visible in the browser. The queues of scripts that can stop your website from loading fully are the render-blocking JavaScript and CSS files.

When the script queue is very long, it can take a while before visitors are able to access your site. Often, many of these scripts aren’t necessary for viewing the website right away, and could just as easily wait to run until after the site itself is fully loaded.

2.Server-side rendering (SSR):

Basically all of your page’s resources are housed on the server. Then, when the page is requested, the HTML is delivered to the browser and rendered, JS and CSS downloaded, and final render appears to the user/bot.

3. Client-side rendering (CSR):

This relies on JS executed on the client-side (browser) via a JavaScript framework. Essentially the client will first request the source code which will have very little indexable HTML in it, then a second request will be made for the .js file containing all of the HTML in JavaScript as strings.

4. Why Is Render-Blocking JavaScript and CSS Bad For Webpages?

Render-blocking JavaScript and CSS scripts slow down your webpages, which is bad for a lot of reasons. Site speed plays a role in many vital aspects of your website, including general usability and search engine optimization (SEO). When your site loads slowly, you are more likely to lose visitors, and less likely to be ranked highly in search engine results.

Of course, site speed is affected by more than just render-blocking scripts. That said, this a factor that can make a significant difference in load times. Remember that every resource on a webpage takes up bytes, more of which result in longer download times. The fewer and lighter scripts your site has, the better. After all, you don’t want to let a slow site negatively impact your business.

5. Recommendation:-

1. Fix if possible or remove the render-blocking issues. (Avoid having JavaScript in the body of the coding. Your JavaScript code should be placed at the bottom of the files.)

2. Properly call your css files

3. Do not use @import to call css

4. Properly label conditional css

Use less CSS files in the critical path

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