There are bugs / performance issues currently that make the sim run much slower than it should.
The devs are working round the clock to fix it and improve performance.
A patch is expected at the end of this week (if all goes to plan) that should improved a lot of the issues, namely micro-stutters,buildings and trees impacting performance. Not everything will make the patch tho and it will be an ongoing update of patches.
My advice would be give it 2weeks to 1month before upgrading too much more as even with a core I7 and GTX580 you would still have lots of issues.
Steam Activation errors, I would open a support ticket via the Steam Website.
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