Apple Silicon 4K SSD write performance is abysmal. Sad to say, M2 appears to have no improvement over M1. Based on observations 4k writes are about 4x slower than a 2010 Mac Pro with a NVMe SSD. There is clearly a bottleneck in there somewhere that's bigger than the elephant in the room. FWIW... 4K write performance of the Mac Studio's 1TB SSD is constrained like it's sitting behind a thunderbolt interface.