This is a technique product page: a smaller copy of this image was already in your cache from the grid, so it was displayed immediately behind the first large image as a placeholder during load.

Depending on the size difference between the grid image and this image, the transition may be more or less noticeable. Adjust the tile size on the grid view to see the impact of different cached sizes.

Depending on the size of the cached grid image, the LCP that real users' browsers report for this page may also improve. And even when the metric does not move, the experience of visitors arriving from the grid still does.

This is a technique product page, but you arrived without coming from the grid, so nothing was assumed cached and no placeholder was shown. The page behaves like the standard version.