Geez the list of changes is Huge. Imo the biggest and best change was that we had a bonafide C++ Game programmer, username billw, that came in overhauled much of our coding with Major optimizations. He also got us to move to Git. (We still maintain the SVN too). This in turn brought in several other C++ coders like MattCA who is still optimizing. End of Turn waits (EoT) and late game EoT's are greatly shortened and reduced. He also strengthened the AI in many areas. There is even a Discord channel for C2C. Areas of changes of the top of my head: Tech tree, Civics, Culture, Game set up options, Map script optimizations and enhancements. AI interactions in relation to each other and to player. I know I'm forgetting many more. Perhaps Toffer90 or raxo2222 may chime in as they are much more involved in the coding and xml overhauls that went on since v38. And Welcome back!