[AceJohnny2]

Side-note, I had a performance bug in Civ IV: Colonization. The longer I played, the laggier it got. I would have to restart the game to recover.

I vaguely recall the embedded Python being accused of poor performance. I wonder if that's why they switched to Lua in later engines.

[TMWNN]

I never tried the Colonization mod, but experienced the same thing with Civ IV BTS back in the day.