Could you post your RAM, CPU, and Graphics card specs? Because "clicking on a city for the first time and then it's stuck" sounds like a sort of RAM problem. If it's not, CPU is the most likely culprit, and if that's not it either then your Graphics card may give the CPU & RAM some trouble. (Because it's not being capable of it's job, and therefore your PC has to rely on CPU & RAM helping out.)
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