And why is this important to you?
When you visit a website, you’re requesting your server. Every time a user requests your server, it has to deal with this request by consuming its computing power.
Simple one-off requests are not an issue, but when your site gets bloated, it can become overwhelming for a server that is not prepared or set up in a proper way. As WordPress makes it easy for any user to install a lot of features, it can become a burden on your servers.