I tried it with current Metashape 1_5_0_64x and then went back to Photoscan 1_4_4_64x.
Those 15-20% is from 1.4.4 and with current Metashape 1.5.0 I have even less GPU loading , actually hardly any load at all , maybe 3-4% during dense cloud building.
Metshape does it just forever The GPU checkbox setting was checked in in both
Should I try to update gpu driver? It's 416.34 currently, not especially old