Counter-Strike 2 runs noticeably worse than Source games like CS:GO and Team Fortress 2. Sadly CS2s Source 2 Vulkan renderer isn’t so great compared to its DX11 renderer, which is only available on Windows. It might mean you’re stuck with worse performance, even I want to upgrade from my RX580 because fps drops feel really bad. When I tried to run CS2 on the Steam Deck fps where ok, but also not great, so sadly it’s not unexpected that it’s not playable on that laptop. Hopefully Valve improves their Vulkan renderer.