1DX II: 16 F/s * 20.2 MP/F = 323 MP/sHow do you calculate it?
M6 II: 14 F/s * 32.5 MP/F = 455 MP/s
455 / 323 = 1.41 ~ 141% Throughput. Even if they achieved that by lowering the bits per pixel, they surely didn't do it in the 90D which does 11 FPS in Live View.
There are no numbers available for the crop mode. If it is only a fraction of the resolution, it might have the same total throughput.