Steam has been gradually going down the route of becoming a “pretty” interface instead of a fast one, and it’s kind of sad. Excessive use of dynamic svgs for home page animations, dynamic gradients that slow everything down, and probably some backend changes too, and all baked in with the base UI so it’s less responsive than it was before, even on decent hardware. Seems like it all started with Big Picture and the gradual migration of that design style into the main client.