That's a useful comparison since it gives some insight to some important differences: part of the difference might be an order of magnitude increase in clock speed (say from 15 MHz to 133+ MHz); another might be an increase in I/O speed. A final one might be memory pressure - classic Mac OS applications conservatively specified memory to reserve in advance since they shared the same memory space, and a lot of purging/reloading of nonessential relocatable resources might be happening.