After installing Mac OS X 10.5.8 (iDeneb) on my machine (spec below) everything worked just fine except I often used to get sytem restart while booting, after the chameleon loader screen. I saw in this forum and modified the boot.plist by adding cpus=1 flag in it. Now everything works fine and I don't get those restarts again but now Mac os x takes longer time to boot than it was before. Is it due to the cpus=1 flag I added ??? What exactly does this cpus=1 means ????

System Spec.
GA-G31M-ES2L(Mobo)
Intel PentiumD 820 (CPU)
2GB 667MHz DDR2 (Transcend)
Seagate Baracuda 250GB SATA
RTL 8139C PCI Ethernet Card

The boot flag cpus=1 tells os x to use only one of your cores and I believe the boot time may slow down a bit, to cut additional time off the boot time, try to remove applehwsensor.kext that should speed up the boot 10-20 seconds.

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GA-Z68XP-UD3: Lion 10.7.3, Windows 7 Professional 64bit SP1 and FreeBSD 9-RELEASE, Core i5 2500K @ 3.3GHz, 16GB 1333 Mhz DDR3 ram(Soon), 1GB GDDR5 Nvidia Geforce GTX 560 Ti, 2X 1TB Samsung F3 SATA HDDs, 1X WDC Blue 500GB HDD; Dell Mini 10v: Obsidian Black, 2GB DDR2 533MHz Ram, 1.6GHz Intel Atom N270, 120GB HDD, 6-Cell, Mac OS X Snow Leopard 10.6.8 Build 10K549