You already asked, and I gave you the answer
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DEM is not a problem, 3D buildings are.
I said Primo 2.0, not Primo 2.4. You can also use primo 1.2, it's great.

It's not so much a problem with memory, but with unnecessary overcrowding, which comes from insufficient knowledge. Nhf.
Surely you don't need maps of Canada, Mexico and the USA all at once, do you?
Besides, when you delete content that Primo can't "see", less than half of the published content will remain.
Read the tutorial instructions carefully