> As I recall, the first switch had the issue of the early PPC chips, 601, was kind of slow, and the boxes not designed well.

I had a first-generation PPC Mac. It was pretty good, I thought. The baseline 601 ran at 60MHz and had a superscalar architecture with 16K instruction / 16K data L1 cache. The high-end 68Ks were not superscalar, ran at 33MHz, and had 4K instruction / 4K data caches.

If anything was slow it was probably because big chunks of code were 68K. My personal experience was that once I switched to PPC, running the same software on 68K felt slow by comparison.