Minify your HTML by removing all the unnecessary characters.
Minify your JS by removing all the unnecessary characters.
Get & verify the meta tags of any website.
Check whether a website is using the Brotli Compression algorithm or not.
Take an IP and try to look for the domain/host associated with it.
Get approximate IP details.
Check whether a website is using the new HTTP/2 protocol or not.
Check if the URL is cached or not by Google.