The lava moat is nice, but it should extend all the wat around the castle. Also, the area around it should have more bare stone (Without vegetation), to fit in with the lava aspect. Also, more smooth stone or cobble to accompany the stone brick. Other than that, it's good.
I've had this problem. I believe the solution is to turn off vertical synchronization in the graphics card control panel. I may have that wrong, but it wouldn't do any harm to try.
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