If the mouse moves erratically:
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If you apply the fix and get a "Serious Error" or a black screen: If the mouse moves erratically: This public link
The Serious Engine 2 was coded well before multi-core CPUs became the industry standard. Splitting processing across modern high-thread CPUs causes severe frame-rate degradation or capping at sub-30 FPS. Fixing this requires adjusting your CPU affinity: and then open the SeriousSam2 subfolder.
: Navigate into the Content folder, and then open the SeriousSam2 subfolder.