Why does my page jump while images load

Because the browser does not know their size until the bytes arrive. Set width and height attributes, or an aspect-ratio in CSS, and the space is reserved from the first layout pass.

Either let it scroll horizontally inside a container with a visible edge fade, or restructure into cards below a breakpoint. Hiding columns is the tempting third option and the one people regret, because the hidden column is always the one someone needed.