Optimization is the process to finding an alternative with the most cost effective or highest achievable performance with given constraints. Optimization refers to a positive and intrinsically concept of minimization or maximization to achieve the best or most favorable result.
It is best for any website to load the content in minimum time or website take minimum loading time. It will affect the users traffic on the website.
Website Loading Time:
The loading time of a website is directly correlated to the requests made on the server to load the website. The more HTTP requests made to the server and the elements take to render/loading, website will be slower.
Loading CSS, Scripts, Images and HTML are some examples which make HTTP request to the server.