# Factors that affect website loading speed in JavaScript

The speed of loading and working of site pages is very important. After all, the slower your site loads, the fewer users will wait for it to finish loading. Because of this, you will lose visitors and, as a result, money.

There are many factors that affect the loading speed of a website. First of all, of course, this is the amount of data you transfer when loading the site: HTML code with text, CSS files, JavaScript, and, especially, images.

The quality of our JavaScript code also affects the site loading speed. The fact is that when writing code, many people often make a number of mistakes, due to which the page will load and work slower than it could.

We will study these mistakes in the next lessons.

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