Blasting pixel data from the CPU to the GPU is normally about as "happy path" as it gets. The entire architecture is designed to make that kind of operation super efficient and super fast.
It's the opposite direction (GPU to CPU) which is a pain in the ass. Still fast if you do it correctly, but it's easy to end up with a stall.
It's the opposite direction (GPU to CPU) which is a pain in the ass. Still fast if you do it correctly, but it's easy to end up with a stall.