Insert products directly into mysql

Hello

I have to insert over a million products from XML files.
I have a script using WC_Product_Simple() , set_name(), set_description(), add_meta_data() etc.
But this script only imports 5 products/minute. It would take months…
It is only the insertion part that is slow, reading the XML is very fast.

So I wonder if it wouldn’t be more efficient to directly insert the products in mysql without using WooCommerce functions?
If so, how to do it ? What would be the table schema?

Thanks for your help !