Slow processing times when generating Orthophoto any tips ?

As the title says, I'm having issues with processing time in creating Orthophotos. 

Basically from what I see is that I can get speeds of 6.9GP/hr. 

As we are processing lots of flights with 1500  @ 20Gp = 35GP, this could take hours.

For ex. 446 photos @ 20mp = 9.5GP took 84 mins. I've used other software where it took 32 mins.

I've been testing on a 3700x 8 CPU with 32 GB of RAM and 2060 Super. I can see that the GPU is being used in the ortho creation step. 

Is there any way I can speed up processing. I set the Geometric precision to "Medium" didn't see that much of a performance boost in terms of speed. I don't see any other options to help with speed ? 

Does creating the tiles at different sizes do anything in terms of speed?

Thanks,