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Basically, that's it. I checked as best as I could, and these issues (crashes and lag) are incurable. Even a licensed copy of SoD didn't help, and neither did the patches or any other methods.
So, the question remains: what are your system specifications? Maybe everyone is using Windows 98 with 32MB of memory and DirectX 3?
And the method of integrating the Conflux and map generator into SoD using zero files actually makes me happy – it works for me, by the way.
Added after 5 minutes:
Yes, and I've confirmed many times that Windows 7 doesn't like classic games (for example, Diablo 2 LOD also crashed and froze), so I support your theory, because I've come to the same conclusion, but I'm still thinking about it.
I hope that someone will still respond and say that everything works perfectly for them on Windows 7 without any rituals or spells.