As an Unreal Engine 5 game, compiling your Stalker 2 shaders on initial launch is just something that you need to do, and there is no way around it. How fast it takes will depend entirely upon your PC ...
If you have just started up Stalker 2 on PC then you will be looking at a slowly ticking up percentage as your shaders compile. Don't worry, though; nothing is amiss. As an Unreal Engine 5 game, ...