How to reduce load time of a web application?

A contemporary online application includes several layers, each of which has its own set of optimization guidelines. Let's think about a straightforward three-tier web application and potential improvements (generic)

Make sure there is enough CPU, RAM, disc, network, etc. gear available.Adjust the setup for efficient resource use.minimum amount of logging Reduce Static and Dynamic PHP, JS, and CSSReduce the Network Class and the Data Size of each Call (both request and response)Reduce Static and Dynamic PHP, JS, and CSS