Which of these are NOT part of AMP:
Read more here: https://support.google.com/partners/answer/7336293?hl=en
The following optimizations combined are the reason AMP pages are so fast they appear to load instantly.
To learn more about how AMP works, you can either watch the video featuring AMP engineering lead Malte Ubl or read the information below the video.
Allow only asynchronous scripts
While third-party JS is allowed in iframes, it cannot block rendering. For example, if third-party JS uses the super-bad-for-performance document.write API, it does not block rendering the main page.