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how to fix slow boot time

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Dec 7, 2018
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i5
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HD 6770M
hi all! im a new user here!
first thing i want thanks this website for all the tips and tools you release!:):)
now im going to the point; i registered here because i want to know if is it possible to speed up the boot time of my imac.
exactly, i dont have an hackintosh build but a genuine imac mid 2011 27"; when i bought it there was snow leopard and now im on high sierra. i want to be clear, my mac boot up in 30-40 secs, it's a pretty good results but every time i do an upgrade the computer become slower each time. on the web i saw videos were some old laptop with hackintosh boot mojave in 15 seconds.
on the internet theres a website where they claim it is possible to replace ahci.kext files of the actual os with old ones.
is it possible to do on my mac? i already download kext wizard/multibeast and turned off system integrity protection; also in my home i have the snow leopard install dvd, what can i do now?;);)
 

P1LGRIM

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Moved to iMac forum.
 
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