FPU does nothing for boot times.
All CPU upgrades do is speed up calcs, I have a IIci with a Daystar 68040 running at 48Mhz with a heat sink and fan. Speeds up apps , but cache would make it even faster.
Favorites: big box Mac IIs, 950, 800's
Wanted: Anything Nubus, Video capture and editing hardware and software for 68k mac. Original software including A/UX.
Looking for 9150, Mac II, Color classic, 840av motherboard, and Nubus cards.