Do you research Scientific Method early?
Scientific Method obsoletes all your monasteries which gives 10% scientific research bonus. This could mean taking one more turn to research new techs.
On the other hand, it is a pre-requisite for Communism which could let you run the State Property civic which saves you a lot of maintenance cost.
I also notice that most of the AI players are willing to trade Scientific Method once they've got it. For me, I tend to delay researching it until I am really running short of gold.
Scientific Method obsoletes all your monasteries which gives 10% scientific research bonus. This could mean taking one more turn to research new techs.
On the other hand, it is a pre-requisite for Communism which could let you run the State Property civic which saves you a lot of maintenance cost.
I also notice that most of the AI players are willing to trade Scientific Method once they've got it. For me, I tend to delay researching it until I am really running short of gold.