Ah cool, that’s interesting.

SDL is kind of the equivalent to DirectX. It provides a standard interface for multimedia applications regardless of underlying mechanisms. Except the 3D acceleration part I think which is handled by OpenGL / Vulkan.

Realtime is not about being fast, it’s about time guarantees. It helps with or is required for workloads that require realtime, which I think includes audio production, but might also be helpful for things like controllers etc. where you need to make sure incoming data is processed in a guaranteed time or else fail. Browsing the web isn’t part of these, so an RT kernel will most likely be a hindrance.