Thank you Kyle!
These are my measurements:
Test 1: OneAlex: 250-270 FPS
Test 2: With moon mod + Environment: 200
Test 3: With moon mod + Environment + Patches=90 + Lod factor=15: 250-270 FPS
As you can see if we adjust the patches & lod factor the performance is as before. So you raised a good point!
Feedback helps!