Do you have any experience with the newer ones : Total War : Warhammer? What about the newest civilisation?
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So if I played Rome 2 on a windows partition on this computer it would be less laggy?
As the (fantasy) Warhammer setting doesn't interest me, I haven't played Total Warhammer. From what I heard, it runs great, though. I also haven't played Civ VI.
Rome 2 should work much better under Windows. Attila does.
From a non-geek : Why is it better?
And more importantly, will High Sierra change that?
In general, because the performance is better. Games for Windows are usually developed with DirectX in mind. When they get ported to macOS, they had to be rewritten to use OpenGL, which lead to a significant performance hit, especially since Apple's OpenGL implementation is outdated and just crap.
However, Apple introduced Metal as new graphics API last year. After some teething pain, it now seems to be ready for prime and actually delivers a fairly good performance, sometimes on par with DirectX. But there still aren't many games using Metal at the moment.
High Sierra will bring improvements that all Metal games should profit from, and when they are specifically adapted to High Sierra's Metal 2, they should perform even better. OpenGL games won't benefit from these improvements.
