Thanks for the ACPI Platform kext i will try it later today. I feel a bit uncomfortable installing 10.6.x kext on 10.9 but if it works then i'm good I also want to understand the problem if possible. I might attach a serial cable and do remote debug to see where the CPU is spending time.
The AppleRTC patch im using is the last port of the second link, i actually created this patch
perl -pi -e 's|\x41\x89\xd7\x41\x89\xf4|\xe9\xb8\x00\x00\x00\x90|;' /System/Library/Extensions/AppleRTC.kext/Contents/MacOS/AppleRTC
In AppleRTC there is a cmos write routine, so i short circuit it to not touch cmos at all (e9 b8 is jmp to end of routine). As far as i could see in IDA, cmos writes are used to update the system clock and to wake up the system after some time period (alarm). I don't care about those features to the patch is good for me. Haven't had any CMOS errors after applying it.