Just got my Vicky 2 (yay), patched it to 1.2 and intend to give it a serious try, but it does seem stable so far. I haven't encountered the performance issues mentioned yet, but i would expect to. Considering the gameplay depth, the added burden of gorgeous graphics could easily send performance out the window. I am confident that future patches will fix Vicky 2, but the issue must be taken under consideration for all future games. After all, i believe we all prefer gameplay to graphics here, don't we?
It's not graphics, it's POP handling. POPs are the biggest performance drain - fixing issues that cause unnecessary/too many calculations will fix performance.