Implement lazy loading for images and iframes in MotD, Q&A and question focus.
For the benefits, see here: https://developer.mozilla.org/en-US/docs/Web/Performance/Lazy_loading
<img src="image.jpg" alt="..." loading="lazy">
<iframe src="video-player.html" title="..." loading="lazy"></iframe>
For videos use:
<video controls preload="none" ...>