[ref]MaLd0n[/ref], I ran VDADecoder and displayed this
" GVA info: Successfully connected to the Intel plugin, offline Gen95
Hardware acceleration is fully supported
logout "
Luckily I did some research and I wanna stand for future users who are interested on FCPX ( Final Cut Pro ) that the longer and bigger gets a project on this software, the more clunkier and slower will performance gonna be, I had 4k material on a 500GB project and performance was so so, then when I did a little project with 4k files and only 50GB playback was awesome. This is bad only when you're editing, when you Render your final edits performance will be always the same.
Also, at least leave 100 GB unused space on the Hard Drive you put your library.
[ref]MaLd0n[/ref], again thank you for your help, if you have any nice tips, I'll appreciate it. Cheers.