i have amd leo4all v4.1 leopard 10.5.4 installation with voodoo 9.5 kernel.
my cpu: amd athlon 6000+ on asus m3a with sb600 chipset

my performance issue is: i can't burn my dvd's at supported speeds like 12x or 8x, sysprofiler says media supported with 12x burning speeds, recognizes my drive as generic burning support but everytime i try to burn my dvds at that speed toast writes it at 1x and then tried disco.app too, still no luck at higher speeds. am i missing something?
my installation works perfectly and qe enabled by the way.

is there anything i must do to force the dvd writer to burn higher speeds?
is there any system settings i check or drivers i must install?

ps: i don't know is it relevant with this but my installation boots slow too, it takes approximately 2-3 mins

thanks in advance..

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Asus M3A with ATI SB600/ATI RD770
AMD Athlon X2 6000+
Asus nVidia 8800 GT
2gB DDR2 800MHz RAM
Samsung 400GB SATA
Western Digital Caviar Black 1TB SATA
Philips 1640 DVD writer
iAtkos v7ia
Voodoo Kernel 9.5

Dell D630:
Intel [email protected]
3GB DDR2 667MHz
Intel GMAX3100 144MB
1440x900
Universal OSX Snow Leopard 3.6
DSDT(everything works with vanilla)