Your web browser is using HTTP/1.1.
If your web browser is using HTTP/2, then my website will load faster because HTTP/2 compresses the headers.
HTTP/2 also supports server push, which consists in the server sending resources that the client didn't request first.
In HTTP/1.1, the web browser first has to send a request to get a resource. Sending requests and getting responses from the server takes time.
In HTTP/2, the web browser just has to send one request to get an entire web page, because of server push, that allows the server to send all resources of the web page in response to just one request.