I don't know. The iBook G4 had DDR 333 MHz PC2700 at best. The modern SSD of a Macbook M3 is about twice as fast in GB/s (2.5GB/s vs 5GB/s). The latency is likely worse, but at the same time the M3 has much bigger L1 and L2 caches (192KB*8 vs 64KB, and 16MB vs 512KB).