[Manyula]

Thanks for the advice, but that didn't work. The lags seem to increase the more objects are loaded. I also tried reinstalling the game, but that was of no use either. And no, I don't have any mods whatsoever installed.

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Here's more information. I just realized that not only the game starts lagging terribly, but my whole computer aswell. While the game is running, the CPU load is at about 35-40% and it takes about 0.3MB of RAM. I'm taking a closer look at the temperatures now.