Frame pacing problems - stutters

[nebej]

Could you provide a video of a indoor level as well?

Another thing you could do that would help us would be if you could take a screenshot of the FPS Graph right after a spike.

To activate it set <Main DebugMode="true" ..> and then Press F1 to bring up the debug menu. Then scroll down to the bottom and click Show FPS Graph

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One more thing you could try is to turn the Texture Quality to Low and restart the game. If it works it would eliminate some possible reasons for the stuttering