The differing scroll rates of the side-grid & background image is called the parallax effect.
Besides that, it looks like some CSS animations specified in the stylesheet around the `.space-grid-wrap` selector which adjusts some of the scrolling behavior.
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[ 3.1 ms ] story [ 17.0 ms ] threadBesides that, it looks like some CSS animations specified in the stylesheet around the `.space-grid-wrap` selector which adjusts some of the scrolling behavior.