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Perhaps the universally beloved XXXL won't work very well on this engine.
A couple of maps have long turns; the rest are acceptable.
And those who created maps using random generation, including XXXL, know how the PC slows down over time.
Load a slightly larger map, and that's it. The PC freezes.
This is a serious flaw in the Fifth installment.
+++
But nothing terrible.
Soon, the Sixth installment will be released, and I really hope that in it, the PC won't lag on XXXL.
That is, this bug won't exist.