How to Lazy-Load external scripts for better page speed?
Join Elixir newsletter
Subscribe to receive Elixir news to your inbox every two weeks.
Expand your skills
Download free e-books, watch expert tech talks, and explore open-source projects. Everything you need to grow as a developer - completely free.
Nowadays, with an ever-growing number of web services, we tend to overload Web apps with external resources. As a result, it decreases page load speed and affects SEO score. There is a pretty easy solution for that.
Let's assume that you'd like to use the chatbot on your website. Fetching all resources might take in this case, for example, 2 seconds (which is not that unusual - trust me).
Even if your website is fully optimized to load fast, users will still have to wait 2 more seconds for full interaction.
In this case, if you don't need a chatbot to appear immediately, you can lazy-load the script:
setTimeout(function () {
var d = document,
s = d.createElement("script");
s.src = "path-to-js-script";
d.body.appendChild(s);
}, 5000);That's it. After 5 seconds, a chatbot will be fetched and attached to the body of your website.
It's important to use a time interval that is long enough to run after the page is fully loaded. In this example, I used 5s interval, but you should use the one that match to your specific case.
Related posts
Dive deeper into this topic with these related posts
You might also like
Discover more content from this category
Pattern-matching is one of the finest elixir-lang features. Whoever knows the power of this tool once, will want to use it forever.
Warnings in Elixir are usually an important sign of a problem in the codebase. There is an easy way to make them gone.
The macro mechanism in Elixir is not only an interesting metaprogramming feature - in fact, it is at the language's very core. And the more awesome fact is that, using macros, you can override the algorithm of defining functions itself!