You can pop multiple GPs on the same turn if you micromanage your specialists:

This can give you even more advantage over the AI on top of other stuff like Great Scientist farming, and Civil Service / Acoustics slingshots, and is very helpful in OOCs.
I've not been micromanaging it much in this game though, I only just figured out how to do this.

This can give you even more advantage over the AI on top of other stuff like Great Scientist farming, and Civil Service / Acoustics slingshots, and is very helpful in OOCs.
I've not been micromanaging it much in this game though, I only just figured out how to do this.