Pro Tools Ultimate CPU Spikes.. come on!!!!

[toolz]

I’m running a Mac Pro 5,1 12 core machine with 64 gig of ram, and HD native PCIe with three HD I/O on Sierra with Protools 2018.4

My Client commented on clicks/ artefacts whilst recording an acoustic guitar (stereo track to a click) Today, it's my first day running this version, having build a new OS drive.

I did further investigations..

The session is 24 bit 96kHz, with no audio playing, just moving the cursor around rapidly the blank session causes spikes over 75%, with heavy movement it goes red.

This is a buffer size of 128.

I have my old Yosemite disc with Pro Tools 12.8.1 to boot into for comparison.

In the same situation, Yosemite, I get no issue with any spiking, so it rules out any hardware issue, it feels/and is very powerful. In the same way, I record 24 tracks at 96k 128 buffer and can punch in with no spikes to the CPU

I’ve just renewed my subscription for another year.. but again forced to use a 2017 version of PT’s even though all my hardware is supported/qualified.

Any thoughts?