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Well then, lets open this can of worms shall we? Nothing personal against the employee at PDX responsible for it, but recently i started playing with some mods that disable various parts of he AI, and replace their function with scripts. Imagine my suprise when said mods did what they promissed, and also made my late games much faster.
Point being, improving the AI does not only mean to make it able to work with the games systems, but also to optimize it. If some repeating event scripts can do a better job with les resrouce use, then something is seriously wrong with your AI.
Id honestly advice them to hire a dedicated AI programmer, be it full time or just per outsourcing contract.
The engine is 32bits, so it suffers a lot from any kind of bottleneck in your system. (And i better not go on about Intels x86 lottery, otherwise ill get swarmed by intel fanatics...)
I personally am running a Ryzen system, 800 stars are my standard size as i want lots and lots of empires and such. A buddy of mine is also running an i7 on a higher clock than i did on my ryzen, yet he always had more late game throttling due to his mainboard bottlenecking his systems performance.