Preventing obsolete JavaScript from being delivered to modern browsers

Making website more secure and faster? One piece of advice you may get is Prevent obsolete JavaScript from being delivered to modern browsers. What is Preventing Obsolete JavaScript from being delivered to modern browsers and how exactly does this work on a Web site? On this page, we explain this to you.

What is Preventing obsolete JavaScript from being delivered to modern browsers?

Preventing outdated JavaScript from being delivered to modern browsers is one of the pieces of advice that a program like Lighthouse or Google PageSpeed Insights gives you. It says something about the speed and security of your website. By optimizing this, you benefit from more security and better load times.

The danger of outdated JavaScript

Nearly all Web pages on the Internet use JavaScript, a well-known programming language that provides needed extra functionality on a page. However, there are occasional instances of outdated JavaScript. And when the page delivers this to a modern browser, it potentially causes a slowdown in loading speed.

Are you using Google Chrome, Internet Explorer, Mozilla FireFox or one of the many other available browsers? In all cases, it is possible that there is obsolete JavaScript. Outdated JavaScript makes websites insecure and easier to hack. Therefore, it is important to avoid this.

The impact of Preventing Obsolete JavaScript from being delivered to modern browsers on SEO

Preventing outdated JavaScript from being delivered to modern browsers potentially impacts the SEO of a website or page. It mainly impacts the security of a Web page, but the reliability of a Web page is very important for SEO. Providing outdated JavaScript is not conducive to security and therefore not conducive to SEO; by avoiding it, it is definitely

My advice

Outdated JavaScript: It is not always obvious that you are dealing with this, especially when you do not have the technical knowledge yourself. Therefore, we recommend hiring a programmer with JavaScript experience. In this way, it is possible to update outdated code and make other necessary changes. This ensures you more security on the website.

The most complete book on website speed

I’ve written so much about speeding up websites and everything involved that I like to divide it into different sections; general, tools, speed improvement points and tips. Feel free to see and consult all the links below to learn more about tools and tips for speeding up your website.

General

• What is the website speed
• Website speed: The division between marketing and development
• The influence of SEO on UX
• The influence of web design on SEO
• SPAs and SEO
• What are the Google Core Web Vitals?

Tools

• Autoptimize
• Pagespeed.Compare
• W3 Total Cache
• Tools Pingdom
• Google Pagespeed Insights
• GTMetrix

Verbter points for speed

• First Contentful Paint (FCP)
• Time To First Byte (TTFB).
• Time To Interactive (TTI).
• Image for Largest view with content (LCP) preloaded
• Enable text compression
• Reduce the CSS
• Total Blocking Time (TBT).
• Speed Index
• Reduce JavaScript
• Largest Contentful Paint
• Avoid an overly large DOM
• Delete unused CSS
• Remove unused JavaScript
• Deliver images in modern layouts
• Connect in advance to required origins
• Use an efficient cache policy for static items
• Remove duplicate modules from JavaScript
• Avoid multiple redirects
• Encode images efficiently
• Use lazy loading
• Load important requests in advance

General tips

• Tips for quickly loading a video
• Using Edge SEO for a faster website
• Installing a Content Delivery Network for SEO
• Optimizing images for SEO
• The influence of hosting on SEO