Loading PBR skin takes progressively longer

Grom19

i loaded the same character 3 times (Daz Uber)
1-33.955s
2- 33.568s
3- 33.722s

Then i load the same character but with the PBR skin shader

1- 0m 44.592s 

2- 1m 22.689s

3- 2m 2.639s

I understand it taking longer because the PBR shader is more complicated and has more maps but it taking longer each time makes no sense. It seams to me like when i load a character that has the PBRSkin shader its calculating every other character with the skin shader again, something that doesn't happen with the Uber skin shader