Flappie, I'm glad you asked because I just gave another try to MT.
Before yesterday's update I had black tearing in VR and less performance than in ST. Today it SEEMS that MT is working better.
My system is i9-10900k, 32GB DDR4, RTX3090 and dedicated NVMe 2TB SSD. HP Rev.G2 VR.
I will keep testing and will let you know.