I had kabbylake (4.6ghz) 4 core I5 . I had issues with stutter and lag. Developer mode often displayed in red. Spent a long time changing settings and experimenting. Could only get minor improvement. Overclocked cpu made it worse, so removed overclock. Limited by cpu. MSFs is ok
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Built a new pc for MSFS 2020 with 8 core (3.8-5.1ghz) I7. Stutter and lag issues have gone. Developer mode displayed green. Limited by gpu . MSFs is really good/excellent