Since I moved my OSx86 10.5.3, 9.3, EFi V8 install to an internal IDE HD, boot time is 25-30 seconds.

Gigabyte 6100/430 s939 MB with Athlon 64 X2 4200+ dual core CPU
2GB PC6400 DDR2 dual channel RAM
8600GTS 256MB video card
PCI Realtek 8169 gigabit LAN card
onboard ALC880 audio

My Phenom install boots in 40-45 seconds - booting off a 60GB 4200RPM 2.5" laptop HD in a USB 2.0 enclosure:
Zephyroth 10.5.1, Chameleon EFI for Phenom, Zephyroth ASU 0.5 update to 10.5.3, 9.3 modbin kernel:

Gigabyte GA-MA78GM S2H AM2+ MB with Phenom 9550 2.2GHz quad core CPU
2GB PC8500 (1066MHz) DDR2 dual Channel RAM
onboard Radeon HD3200 IGP video
onboard RTL8111c LAN
onboard ALC889a audio

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Running both 10.5.8 and 10.6.4 on my stinking AMD/ATi machine...