What are the nvidia NGC container optimizations for mixed precision?

I am trying to increase the training speed of my model by using mixed precision and the nvidia gpu tensor cores. For this, I just use the keras mixed precision, but the speed increment is only of 10%. Then I found the nividia ngc container, which is optimized for their gpus, and with mixed precision I can increase the training speed a 60%, although with float32 the speed in lower than native. I would like to have at least the speed increase of ngc container natively, what do I need to do?