Properties related to the timing of various events during the page load process, such as the time it takes for the page to load, the time to the first byte, and the time for different elements of the page such as images and stylesheets to be loaded, paint and rendered.
Properties related to the number and size of requests and responses made during the page load process, such as the number of requests, the number of responses with different status codes, and the total size of data transferred.