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  • RasterBrick builds on rgdal so that could explain the difference. Then again, the replicate test is not relevant, because you normally would extract many cells in one step, which is a different problem. Commented Jul 22, 2016 at 23:06
  • I agree, maybe a test with various randomly chosen cells (or maybe blocks of cells) would be more appropriate. Commented Jul 23, 2016 at 11:37