Drop-outs and high VST load since update to 8.5


I have a Mac Pro 2 x 4 core 3Ghz, 10.10.5, 18GB RAM, 500GB SSD and 2TB RAID1 HDD for libraries and projects,

Since I updated Cubase from 8.0 to 8.5 along with Absolute Collection from 1 to 2 I have high Average load and have huge problems when using VST effects, I cannot find issues anywhere, I have tried changing the sound interface from Motu 896 to TC Connect 6 but no changes,

I notice hi average load even before playing the song, the Mac Activity monitor does not show usage over 50%

I don’t know what i should check next, if anyone has any idea…

Thanks in advance,

any help?