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diff --git a/users/aspen/xanthous/bench/Xanthous/Generators/UtilBench.hs b/users/aspen/xanthous/bench/Xanthous/Generators/UtilBench.hs
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+--------------------------------------------------------------------------------
+module Xanthous.Generators.UtilBench (benchmark, main) where
+--------------------------------------------------------------------------------
+import           Bench.Prelude
+--------------------------------------------------------------------------------
+import           Data.Array.IArray
+import           Data.Array.Unboxed
+import           System.Random (getStdGen)
+--------------------------------------------------------------------------------
+import           Xanthous.Generators.Util
+import qualified Xanthous.Generators.CaveAutomata as CaveAutomata
+import           Xanthous.Data (Dimensions'(..))
+--------------------------------------------------------------------------------
+
+main :: IO ()
+main = defaultMain [benchmark]
+
+--------------------------------------------------------------------------------
+
+benchmark :: Benchmark
+benchmark = bgroup "Generators.Util"
+  [ bgroup "floodFill"
+    [ env (NFWrapper <$> cells) $ \(NFWrapper ir) ->
+        bench "checkerboard" $ nf (floodFill ir) (1,0)
+    ]
+  ]
+  where
+    cells :: IO Cells
+    cells = CaveAutomata.generate
+      CaveAutomata.defaultParams
+      (Dimensions 50 50)
+      <$> getStdGen
+
+newtype NFWrapper a = NFWrapper a
+
+instance NFData (NFWrapper a) where
+  rnf (NFWrapper x) = x `seq` ()