When I export everything is fast, but when I click on auto-import, C4D or Maya the process takes a long time, it is very slow and consumes all my ram memory I have, 16gb of ram, what will be happening?

try auto-imp0rt instead

could be anything, enable virtual memory, CUDA on the nvidia card's will use it for memory pooling, and allow render data to go upto 1TB + without needing physical memory sizes

VEGA cards will also use virtual memory for openCL, any AMD cards previous, will just crash when you run out of physical RAM

virtual memory/swap file, has to be set to system managed for it to work fully