What are HTTP requests?
HTTP requests are requests that get sent to the server whenever someone visits your website. These requests can contain a variety of information for the server to process and act upon. The most important part of such a request is the URL. Based on this information, the server will try to return a valid response, such as a file. The first stable implementation of HTTP, HTTP/1.0, does these requests in series. This means that a group of requests needs to be finished before the next group is sent. Obviously, this means that pages with a lot of external files will suffer from longer loading times, making your website slow.
Speeding up initial loading times