I have been using this plugin for a very long time and sometimes I have to wait a lot of time to generate 10x10k worlds for several hours. I would like to suggest that in the plugin settings it would be possible to adjust the generation speed, since in any case I always generate a map without players, and it would be possible to have a higher speed than now. Chunk generation has been observed to take up approximately 10-15% of CPU resources, although it has a very high potential (r9 7950x). If the plugin had a speed setting function, it would be very cool!
Thank you!

p.s.
I know there is a "Fast Chunk Pregenerator" but I don't really like it..

There are no options that need to be changed plugin-side, it runs as fast as it can already. See the FAQ for more information.

On a dedicated 7950x you should be able to get much higher than 80-90 cps (I get a few hundred on mine) if you configure things correctly in the server.