Inventory every image, script, stylesheet, iframe and third-party host.
Free, no signup. We fetch the page once and read what your server sends back.
Each resource is a request, and each third-party host is a DNS lookup and TLS handshake before anything downloads. Counting them is the quickest way to see where a page has accumulated weight over the years.
With HTTP/2 the old "fewer requests" advice matters less. Third-party hosts still cost connection setup, so those are the ones worth counting.
Each one needs DNS resolution, a TCP connection and a TLS handshake before a single byte arrives. On mobile that can be several hundred milliseconds each.
A hint telling the browser to open a connection to a host early, so the resource downloads sooner when it is requested. Use it sparingly on hosts you know you need.
No. It reads the HTML source, so anything injected at runtime is not visible to it.
Run the full free report, or have us go through it with you on a call.