hi, just made the update of FCPX to 10.4.9, and Suplemental update osx 10.15.6, i update also my codec video.
Now the FCPX is slow, respond video play is slow, preview is slow, the 10.4.8 before was working perfect and Fast. All Kext is uptodate, i use clover 5119, My Video Card is AMD 580