Mountain Lion Slow Boot Up Time

Hey
This is my 2nd hackintosh. I have gotten ML to run but the boot up time is really slow compared my previous Lion. I have UseKernelCache=Yes in my plist and have attempted to rebuild Extension.mkext.

Hopefully someone in this forum can help out. Thank you in advance.

Build: Core i5 IVB
Asrock Z77 Extreme4
Galaxy NVIDIA GTX 460 1GB
SanDisk 240 GB SSD
Kingston HyperX 16GB RAM

Virtu3ous said:

Hey
This is my 2nd hackintosh. I have gotten ML to run but the boot up time is really slow compared my previous Lion. I have UseKernelCache=Yes in my plist and have attempted to rebuild Extension.mkext.

Hopefully someone in this forum can help out. Thank you in advance.

Click to expand...

Replacing these 2 kexts with the ones from Lion worked for me.

AppleAHCIPort.kext
IOAHCIFamily.kext


Once I did this and and used UseKernelCache boot time went from 1:08 to 0:35 seconds

Did you use KextBeast or others to replace those kexts?

Virtu3ous said:

Did you use KextBeast or others to replace those kexts?

Click to expand...

Personally I used Kext Wizard, I am sure KextBeast will work just as well.
I also rebuilt the cache from Kext Wizard as well.

solbergw said:

Replacing these 2 kexts with the ones from Lion worked for me.

AppleAHCIPort.kext
IOAHCIFamily.kext


Once I did this and and used UseKernelCache boot time went from 1:08 to 0:35 seconds

Click to expand...

Awesome! You just made my day as this had been plaguing me since launch. Now ML boots up in 2.5 seconds as Lion did. Honestly though, I needed to replace those 2 kexts in DP4, and had forgot I needed to so I would not hang on "still waiting for root device...". Reading your post gave me an "Oh SNAP!" moment.

I hope Apple addresses this in the next update; I hate rolling back. It's bad enough I had to roll back the IOUSBFamily and IOUSBMassStorageClass kexts to get USB 3 working. Ah well, me happy again!

Would you be able to upload those two kexts for me please? I got the same issue and I don't have any back ups of those kexts, Thanks

Get it here http://www.mediafire.com/?9v1fr0dbd8ub94g

Modification original Kext

kext_dir=/System/Library/Extensions
cd $kext_dir/IOAHCIFamily.kext/Contents/PlugIns/IOAHCIBlockStorage.kext/Contents/MacOS
sudo mv IOAHCIBlockStorage IOAHCIBlockStorage.orig
sudo cp IOAHCIBlockStorage.orig IOAHCIBlockStorage
#patch relocation table for our patch point - kprintf() -> IOSleep()
sudo /usr/bin/perl -pi -e 's|\xeb\x4c\x00\x00\xea\x03|\xeb\x4c\x00\x00\xe8\x01|g' IOAHCIBlockStorage
#Make unconditional call to IOSleep(200) at beginning of kext
sudo /usr/bin/perl -pi -e 's|\x74\x0e\x48\x8d\x3d\xa5\x90\x00\x00|\xbf\xc8\x00\x00\x00\x90\x90\x90\x90|g' IOAHCIBlockStorage
sudo touch $kext_dir

No luck I installed those kexts with Kext Wizard and rebuilt my cache but still its taking same time to boot.

Thanks for the upload but unfortunately it didn't help me either, still have the slow 1 min boot instead of 10 seconds I used to get on Lion, might have to wait until Muiltibeast 5.0 comes out and see what I can do from there.