hi guys. i have this scene with ice material on it. there seems to be a checkered part at the upper and bottom part of it. check this out.

anybody knows what causes it?and also..any advice on how to render this much faster?this is a 640x480 image and it took 22 mins. im using i5 760, 4gb ddr3.
IRR -4,-4
LC 300
Thanks in advance!

anybody knows what causes it?and also..any advice on how to render this much faster?this is a 640x480 image and it took 22 mins. im using i5 760, 4gb ddr3.
IRR -4,-4
LC 300
Thanks in advance!
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