Server-side pregen very slow

I'm running a server on my pc to pregen chunks (I have a 7800X3D cpu) but is generating maybe 0.1 chunks out of the 1000 every second. How can I make it pregen faster?

For context, I am running a server on Oracle Cloud free tier, but it would take a while to generate on that limited hardware, so I'm going to pregen on my PC then transfer the world to the server via FTP.
Solution
Set globalExecutorParallelism to your thread count in the c2me config file
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