I’m very surprised WP All Import can’t handle this.
It imports 25-30k posts per hour on clean install. Import becomes slower after 200k posts (7-10k posts per hour)
If you’re trying to do this on a VPS or shared/reseller/cloud hosting
I have 4 Cores, 4 GB memory and NVMe storage.
If I manage to import 8 million posts website will be slow? There is no reason to do it unless I have serious hardware, right?
WordPress is not the correct solution for you
What’s the correct solution?