Peanuts! My wife’s workplace has an internal photo gallery page. If your device can cope with it and you wait long enough, it’ll load about 14GB of images (so far). In practice, it will crawl along badly and eventually just crash your browser (or more), especially if you’re on a phone.

The single-line change of adding loading=lazy to the <img> elements wouldn’t fix everything, but it would make the page at least basically usable.