I have had a similar feeling but have to test it more. It sounds like what happens when you do multithreading that many seems to think is an easy task... The landscape object handling /texture loading etc is on it's own thread now (?) that does not run in sync with the main render thread? If you sync every frame the whole game will stutter so when the landscape thread cant keep up this is what could happen? The main render thread "pumps on" but the "landscape" is not able to keep up?
Just guessing...
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