diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+## 0.1.1
+
+* Introduce `Test.Tasty.Bench.Crossover`.
+* Introduce `guessPolynomialComplexity`.
+
 ## 0.1
 
 * Initial release.
diff --git a/src/Test/Tasty/Bench/Crossover.hs b/src/Test/Tasty/Bench/Crossover.hs
new file mode 100644
--- /dev/null
+++ b/src/Test/Tasty/Bench/Crossover.hs
@@ -0,0 +1,145 @@
+{-# HLINT ignore "Avoid restricted function" #-}
+{-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE NumDecimals #-}
+{-# LANGUAGE RecordWildCards #-}
+{-# LANGUAGE ScopedTypeVariables #-}
+{-# OPTIONS_GHC -Wno-unrecognised-pragmas #-}
+
+-- | Find a crossover point to switch between two algorithms.
+--
+-- @since 0.1.1
+module Test.Tasty.Bench.Crossover (
+  crossover,
+  crossovers,
+  mkCrossoverConfig,
+  CrossoverConfig (..),
+) where
+
+import Control.DeepSeq (NFData)
+import Data.Bifunctor (first)
+import Data.List.NonEmpty (NonEmpty)
+import qualified Data.List.NonEmpty as NE
+import System.IO.Unsafe (unsafeInterleaveIO)
+import Test.Tasty (Timeout (..), mkTimeout)
+import Test.Tasty.Bench (Benchmarkable, RelStDev (..), nf)
+import Test.Tasty.Bench.Utils (Measurement (..), measRelStDev, measure, traceShowM')
+
+-- | Configuration for 'crossover' / 'crossovers'.
+--
+-- @since 0.1.1
+data CrossoverConfig = CrossoverConfig
+  { eqlFasterOnLow :: Word -> Benchmarkable
+  -- ^ A benchmark which is faster at 'eqlLow', typically 'nf' @f@.
+  , eqlFasterOnHigh :: Word -> Benchmarkable
+  -- ^ A benchmark which is faster at 'eqlHigh', typically 'nf' @g@.
+  , eqlLow :: Word
+  -- ^ An argument at which 'eqlFasterOnLow' is faster than 'eqlFasterOnHigh'.
+  , eqlHigh :: Word
+  -- ^ An argument at which 'eqlFasterOnHigh' is faster than 'eqlFasterOnLow'.
+  , eqlTimeout :: Timeout
+  -- ^ Timeout of individual measurements.
+  }
+
+-- | Generate a default 'crossover' / 'crossovers' configuration.
+--
+-- @since 0.1.1
+mkCrossoverConfig
+  :: (NFData a)
+  => (Word -> a)
+  -- ^ An algorithm which is faster for small arguments, without 'nf'.
+  -> (Word -> a)
+  -- ^ An algorithm which is faster for large arguments, without 'nf'.
+  -> (Word, Word)
+  -- ^ Small and large arguments.
+  -> CrossoverConfig
+mkCrossoverConfig fLow fHigh (low, high) =
+  CrossoverConfig
+    { eqlFasterOnLow = nf fLow
+    , eqlFasterOnHigh = nf fHigh
+    , eqlLow = low
+    , eqlHigh = high
+    , eqlTimeout = mkTimeout 1e8
+    }
+
+-- | Determine a crossover region to switch between two algorithms.
+-- Ideally the returned crossover region is just a point like @(n, n + 1)@,
+-- but depending on 'eqlTimeout' it could be a larger interval.
+--
+-- While suitable for automatic estimates, 'crossover' generally provides bad user
+-- experience in interactive environments, because it can take a very long time
+-- before it returns a result without any heartbeat in between. Consider using
+-- 'crossovers' or enabling @debug@ flag.
+--
+-- @since 0.1.1
+crossover :: CrossoverConfig -> IO (Word, Word)
+crossover = fmap NE.last . crossovers
+
+-- | Same as 'crossover', but interactively emits a list of crossover regions,
+-- gradually tightening to the final result.
+--
+-- @since 0.1.1
+crossovers :: CrossoverConfig -> IO (NonEmpty (Word, Word))
+crossovers CrossoverConfig {..} = NE.fromList <$> go (RelStDev (1 / 3)) eqlLow eqlHigh
+  where
+    go targetRelStdDev lo hi = fmap ((lo, hi) :) $
+      unsafeInterleaveIO $ do
+        let mid = (lo + hi) `quot` 2
+        if mid == lo
+          then pure []
+          else do
+            (cmp, targetRelStdDev') <- compareBenchmarks eqlTimeout targetRelStdDev (eqlFasterOnLow mid) (eqlFasterOnHigh mid)
+            case cmp of
+              LT -> go targetRelStdDev' mid hi
+              EQ -> pure []
+              GT -> go targetRelStdDev' lo mid
+
+compareBenchmarks
+  :: Timeout
+  -> RelStDev
+  -> Benchmarkable
+  -> Benchmarkable
+  -> IO (Ordering, RelStDev)
+compareBenchmarks tmt = go dummyMeasure
+  where
+    dummyMeasure = Measurement {measTime = 1 / 0, measStDev = 1 / 0}
+
+    go meas1 tgtRelStdDev bench1 bench2 = do
+      meas2 <- measure tmt tgtRelStdDev bench2
+      traceShowM' (tgtRelStdDev, meas2)
+      let derived = deriveRelStdDev meas1 meas2
+          derivedTgtRelStdDev = if derived > 0 then derived else tgtRelStdDev
+      case compareMeasurements meas1 meas2 of
+        LT -> pure (LT, derivedTgtRelStdDev)
+        GT -> pure (GT, derivedTgtRelStdDev)
+        EQ ->
+          if measRelStDev meas2 > tgtRelStdDev
+            then pure (EQ, 0.0)
+            else do
+              let tgtRelStdDev' = max derivedTgtRelStdDev (tgtRelStdDev / 2)
+              first flipOrdering <$> go meas2 tgtRelStdDev' bench2 bench1
+
+compareMeasurements
+  :: Measurement
+  -> Measurement
+  -> Ordering
+compareMeasurements (Measurement mean1 stdev1) (Measurement mean2 stdev2)
+  | mean1 + 2 * stdev1 < mean2 - 2 * stdev2 = LT
+  | mean2 + 2 * stdev2 < mean1 - 2 * stdev1 = GT
+  | otherwise = EQ
+
+deriveRelStdDev
+  :: Measurement
+  -> Measurement
+  -> RelStDev
+deriveRelStdDev (Measurement mean1 _) (Measurement mean2 _)
+  | isInfinite mean1 || isInfinite mean2 = RelStDev 0.0
+  | otherwise =
+      RelStDev $ abs (mean1 - mean2) / max mean1 mean2 / 4
+
+flipOrdering
+  :: Ordering
+  -> Ordering
+flipOrdering = \case
+  LT -> GT
+  EQ -> EQ
+  GT -> LT
diff --git a/src/Test/Tasty/Bench/Fit.hs b/src/Test/Tasty/Bench/Fit.hs
--- a/src/Test/Tasty/Bench/Fit.hs
+++ b/src/Test/Tasty/Bench/Fit.hs
@@ -1,7 +1,8 @@
-{-# LANGUAGE CPP #-}
+{-# HLINT ignore "Avoid restricted function" #-}
 {-# LANGUAGE NumDecimals #-}
 {-# LANGUAGE RecordWildCards #-}
 {-# LANGUAGE ScopedTypeVariables #-}
+{-# OPTIONS_GHC -Wno-unrecognised-pragmas #-}
 
 -- | Guess complexity of the function.
 module Test.Tasty.Bench.Fit (
@@ -15,6 +16,7 @@
   Complexity (..),
   Measurement (..),
   guessComplexity,
+  guessPolynomialComplexity,
   evalComplexity,
 
   -- * Predicates
@@ -35,12 +37,12 @@
 import Data.Ord (comparing)
 import System.IO.Unsafe (unsafeInterleaveIO)
 import Test.Tasty (Timeout, mkTimeout)
-import Test.Tasty.Bench (Benchmarkable, RelStDev (..), measureCpuTimeAndStDev, nf)
+import Test.Tasty.Bench (Benchmarkable, RelStDev (..), nf)
 import Test.Tasty.Bench.Fit.Complexity (
   Complexity (..),
-  Measurement (..),
   evalComplexity,
   guessComplexity,
+  guessPolynomialComplexity,
   isConstant,
   isCubic,
   isLinear,
@@ -48,12 +50,9 @@
   isLogarithmic,
   isQuadratic,
  )
-
-#ifdef DEBUG
-import Debug.Trace
-#endif
+import Test.Tasty.Bench.Utils (Measurement (..), measure, traceShowM')
 
--- | Configuration for 'fit'.
+-- | Configuration for 'fit' / 'fits'.
 data FitConfig = FitConfig
   { fitBench :: Word -> Benchmarkable
   -- ^ Which function to measure? Typically 'nf' @f@.
@@ -74,7 +73,7 @@
   -- Typically 'guessComplexity'.
   }
 
--- | Generate a default 'fit' configuration.
+-- | Generate a default 'fit' / 'fits' configuration.
 mkFitConfig
   :: (NFData a)
   => (Word -> a)
@@ -111,6 +110,11 @@
 -- Consider running such measurements with @-O0@ or in @ghci@ prompt. This is how
 -- the usage example above was generated. Without optimizations your program
 -- allocates much more and triggers GC regularly, somewhat evening out its effect.
+--
+-- While suitable for automatic estimates, 'fit' generally provides bad user
+-- experience in interactive environments, because it can take a very long time
+-- before it returns a result without any heartbeat in between. Consider using
+-- 'fits' or enabling @debug@ flag.
 fit :: FitConfig -> IO Complexity
 fit cnf = converge <$> fits cnf
 
@@ -122,7 +126,7 @@
     ys = NE.toList xs
     zs =
       dropWhile (\(x, y, z) -> p x z || p y z) $
-        zip3 ys (tail ys) (drop 2 ys)
+        zip3 ys (drop 1 ys) (drop 2 ys)
     p
       Complexity {cmplVarPower = varPow, cmplLogPower = logPow, cmplMultiplier = mult}
       Complexity {cmplVarPower = varPow', cmplLogPower = logPow', cmplMultiplier = mult'} =
@@ -135,19 +139,23 @@
 --
 -- If 'fit' takes too long, you might wish to implement your own criterion
 -- of convergence atop of 'fits' directly.
+--
+-- >>> cmpls <- fits $ mkFitConfig (\x -> sum [1..x]) (10, 10000)
+-- >>> traverse print cmpls
+-- 3.36e-8 * x ^ 0.903
+-- 1.39e-8 * x
+-- 1.38e-8 * x
+-- ...
 fits :: FitConfig -> IO (NonEmpty Complexity)
 fits FitConfig {..} = unsafeInterleaveIO $ do
-  lowTime <- measure fitLow
-  highTime <- measure fitHigh
+  lowTime <- measureIt fitLow
+  highTime <- measureIt fitHigh
   let mp = M.fromList [(fitLow, lowTime), (fitHigh, highTime)]
       cmpl = fitOracle mp
   cmpl `seq` (cmpl :|) <$> go mp
   where
-    measure :: Word -> IO Measurement
-    measure =
-      fmap (uncurry Measurement)
-        . measureCpuTimeAndStDev fitTimeout fitRelStDev
-        . fitBench
+    measureIt :: Word -> IO Measurement
+    measureIt = measure fitTimeout fitRelStDev . fitBench
 
     processGap
       :: forall t
@@ -157,7 +165,7 @@
       -> IO (Map Word Measurement)
     processGap gaps mp
       | M.null gaps' = pure mp
-      | otherwise = (\m -> M.insert maxGap m mp) <$> measure maxGap
+      | otherwise = (\m -> M.insert maxGap m mp) <$> measureIt maxGap
       where
         gaps' = M.fromList gaps `M.difference` mp
         maxGap = fst $ maximumBy (comparing snd) $ M.toList gaps'
@@ -188,10 +196,3 @@
 
 d :: Word -> Double
 d = fromIntegral
-
-traceShowM' :: (Applicative m, Show a) => a -> m ()
-#ifdef DEBUG
-traceShowM' = traceShowM
-#else
-traceShowM' = const (pure ())
-#endif
diff --git a/src/Test/Tasty/Bench/Fit/Complexity.hs b/src/Test/Tasty/Bench/Fit/Complexity.hs
--- a/src/Test/Tasty/Bench/Fit/Complexity.hs
+++ b/src/Test/Tasty/Bench/Fit/Complexity.hs
@@ -8,8 +8,8 @@
 -- | Guess complexity from data.
 module Test.Tasty.Bench.Fit.Complexity (
   Complexity (..),
-  Measurement (..),
   guessComplexity,
+  guessPolynomialComplexity,
   evalComplexity,
 
   -- * Predicates
@@ -36,6 +36,7 @@
   levenbergMarquardt2WithYerrors,
   linear,
  )
+import Test.Tasty.Bench.Utils (Measurement (..))
 import Text.Printf (printf)
 import Prelude hiding (log)
 import qualified Prelude as P
@@ -142,18 +143,6 @@
               then 100
               else (if diff < 0.15 then 32 else 10)
 
--- | Represents a time measurement for a given problem's size.
-data Measurement = Measurement
-  { measTime :: !Double
-  , measStDev :: !Double
-  }
-  deriving (Eq, Ord, Generic)
-
-instance Show Measurement where
-  show (Measurement t err) = printf "%.3g ± %.3g" t err
-
-instance NFData Measurement
-
 -- | Guess time complexity from a map where keys
 -- are problem's sizes and values are time measurements (or instruction counts).
 --
@@ -190,6 +179,19 @@
           c1 : c2 : takeUntilLocalMin ((c3, c4) :< cs)
       | otherwise =
           [c1, c2]
+
+-- | Same as guessComplexity, but the power of \( \log x \) ('cmplLogPower')
+-- is pinned to be 0.
+--
+-- @since 0.1.1
+guessPolynomialComplexity :: Map Word Measurement -> Complexity
+guessPolynomialComplexity xys =
+  trace'
+    ("guessPolynomialComplexity " ++ show (M.assocs xys))
+    bestOf
+    [cmpl1, cmpl2]
+  where
+    (cmpl1, cmpl2) = guessComplexityForFixedLog xys 0
 
 guessComplexityForFixedLog
   :: Map Word Measurement
diff --git a/src/Test/Tasty/Bench/Utils.hs b/src/Test/Tasty/Bench/Utils.hs
new file mode 100644
--- /dev/null
+++ b/src/Test/Tasty/Bench/Utils.hs
@@ -0,0 +1,44 @@
+{-# LANGUAGE CPP #-}
+{-# LANGUAGE DeriveGeneric #-}
+
+module Test.Tasty.Bench.Utils (
+  Measurement (..),
+  measRelStDev,
+  measure,
+  traceShowM',
+) where
+
+import Control.DeepSeq (NFData)
+import GHC.Generics (Generic)
+import Test.Tasty (Timeout)
+import Test.Tasty.Bench (Benchmarkable, RelStDev (..), measureCpuTimeAndStDev)
+import Text.Printf (printf)
+
+#ifdef DEBUG
+import Debug.Trace
+#endif
+
+-- | Represents a time measurement for a given problem's size.
+data Measurement = Measurement
+  { measTime :: !Double
+  , measStDev :: !Double
+  }
+  deriving (Eq, Ord, Generic)
+
+instance Show Measurement where
+  show (Measurement t err) = printf "%.3g ± %.3g" t err
+
+instance NFData Measurement
+
+measure :: Timeout -> RelStDev -> Benchmarkable -> IO Measurement
+measure x y z = uncurry Measurement <$> measureCpuTimeAndStDev x y z
+
+measRelStDev :: Measurement -> RelStDev
+measRelStDev (Measurement mean stDev) = RelStDev (stDev / mean)
+
+traceShowM' :: (Applicative m, Show a) => a -> m ()
+#ifdef DEBUG
+traceShowM' = traceShowM
+#else
+traceShowM' = const (pure ())
+#endif
diff --git a/tasty-bench-fit.cabal b/tasty-bench-fit.cabal
--- a/tasty-bench-fit.cabal
+++ b/tasty-bench-fit.cabal
@@ -1,13 +1,13 @@
 cabal-version:   2.0
 name:            tasty-bench-fit
-version:         0.1
+version:         0.1.1
 license:         MIT
 license-file:    LICENSE
 maintainer:      andrew.lelechenko@gmail.com
 author:          Bodigrim
 tested-with:
-    ghc ==9.6.1 ghc ==9.4.4 ghc ==9.2.7 ghc ==9.0.2 ghc ==8.10.7
-    ghc ==8.8.4 ghc ==8.6.5 ghc ==8.4.4
+    ghc ==9.10.1 ghc ==9.8.2 ghc ==9.6.5 ghc ==9.4.8 ghc ==9.2.8
+    ghc ==9.0.2 ghc ==8.10.7 ghc ==8.8.4 ghc ==8.6.5 ghc ==8.4.4
 
 homepage:        https://github.com/Bodigrim/tasty-bench-fit
 synopsis:        Determine time complexity of a given function
@@ -31,18 +31,24 @@
     manual:      True
 
 library
-    exposed-modules:  Test.Tasty.Bench.Fit
+    exposed-modules:
+        Test.Tasty.Bench.Crossover
+        Test.Tasty.Bench.Fit
+
     hs-source-dirs:   src
-    other-modules:    Test.Tasty.Bench.Fit.Complexity
+    other-modules:
+        Test.Tasty.Bench.Fit.Complexity
+        Test.Tasty.Bench.Utils
+
     default-language: Haskell2010
     ghc-options:      -Wall
     build-depends:
         base >=4.11 && <5,
-        containers >=0.5.11 && <0.7,
-        deepseq >=1.4 && <1.5,
+        containers >=0.5.11 && <0.8,
+        deepseq >=1.4 && <1.6,
         infinite-list >=0.1 && <0.2,
-        tasty >=1.4 && <1.5,
-        tasty-bench >=0.3.4 && <0.4,
+        tasty >=1.4 && <1.6,
+        tasty-bench >=0.4 && <0.5,
         regression-simple >=0.2.1 && <0.3
 
     if flag(debug)
@@ -55,9 +61,9 @@
     default-language: Haskell2010
     build-depends:
         base,
-        containers <0.7,
+        containers,
         tasty,
         tasty-bench,
         tasty-bench-fit,
-        tasty-quickcheck <0.11,
+        tasty-quickcheck <0.12,
         tasty-expected-failure <0.13
diff --git a/test/Main.hs b/test/Main.hs
--- a/test/Main.hs
+++ b/test/Main.hs
@@ -16,7 +16,7 @@
 main = defaultMain $ testGroup "All"
   [ testShow
   , testGuess
-  , testProperty "sum is linear" $ ioProperty $ do
+  , testProperty "sum is linear" $ once $ ioProperty $ do
     c <- fit $ mkFitConfig (\x -> sum [1..x]) (10, 10000)
     pure $ counterexample (show c) $ isLinear c
   -- , testProperty "nub is quadratic" $ ioProperty $ do
@@ -30,59 +30,59 @@
 
 testShow :: TestTree
 testShow = testGroup "Show"
-  [ testProperty "Constant" $
+  [ testProperty "Constant" $ once $
     show (Complexity {cmplMultiplier = 5.978911764705882e-9, cmplVarPower = 0, cmplLogPower = 0}) === "5.98e-9"
-  , testProperty "Logarithmic" $
+  , testProperty "Logarithmic" $ once $
     show (Complexity {cmplMultiplier = 5.968840304461118e-8, cmplVarPower = 0, cmplLogPower = 1}) === "5.97e-8 * log x"
-  , testProperty "Logarithmic2" $
+  , testProperty "Logarithmic2" $ once $
     show (Complexity {cmplMultiplier = 5.793061712300056e-8, cmplVarPower = 0, cmplLogPower = 2}) === "5.79e-8 * (log x) ^ 2"
-  , testProperty "Sqrt" $
+  , testProperty "Sqrt" $ once $
     show (Complexity {cmplMultiplier = 8.974841776295381e-10, cmplVarPower = 0.4690504530830262, cmplLogPower = 0}) === "8.97e-10 * x ^ 0.469"
-  , testProperty "Linear" $
+  , testProperty "Linear" $ once $
     show (Complexity {cmplMultiplier = 5.793579541827657e-10, cmplVarPower = 1, cmplLogPower = 0}) === "5.79e-10 * x"
-  , testProperty "Linearithmic" $
+  , testProperty "Linearithmic" $ once $
     show (Complexity {cmplMultiplier = 1.354437369864389e-9, cmplVarPower = 1, cmplLogPower = 1}) === "1.35e-9 * x * log x"
-  , testProperty "Linearithmic2" $
+  , testProperty "Linearithmic2" $ once $
     show (Complexity {cmplMultiplier = 5.754981209362351e-10, cmplVarPower = 1, cmplLogPower = 2}) === "5.75e-10 * x * (log x) ^ 2"
-  , testProperty "Quadratic" $
+  , testProperty "Quadratic" $ once $
     show (Complexity {cmplMultiplier = 5.763471892706858e-10, cmplVarPower = 2, cmplLogPower = 0}) === "5.76e-10 * x ^ 2"
-  , testProperty "Cubic" $
+  , testProperty "Cubic" $ once $
     show (Complexity {cmplMultiplier = 5.736276961481605e-10, cmplVarPower = 3, cmplLogPower = 0}) === "5.74e-10 * x ^ 3"
   ]
 
 testGuess :: TestTree
 testGuess = testGroup "Guess"
-  [ testProperty "Constant" $ checkComplexity isConstant
+  [ testProperty "Constant" $ once $ checkComplexity isConstant
     [(10,5.881e-9),(15,6.05e-9),(20,6.0e-9),(30,5.938e-9),(40,6.074e-9),(61,6.194e-9),(80,6.282e-9),(122,6.105e-9),(160,6.108e-9),(244,5.927e-9),(320,5.93e-9),(488,5.949e-9),(640,5.9e-9),(976,5.892e-9),(1280,5.918e-9),(1953,5.901e-9),(2560,5.918e-9),(3906,5.947e-9),(5120,5.901e-9),(7812,5.906e-9),(10240,5.907e-9),(15625,5.95e-9),(20480,5.982e-9),(31250,5.993e-9),(40960,5.946e-9),(62500,5.901e-9),(81920,5.922e-9),(125000,5.93e-9),(163840,5.928e-9),(250000,6.228e-9),(327680,5.961e-9),(500000,6.025e-9),(655360,5.929e-9),(1000000,5.96e-9)]
-  , testProperty "Logarithmic" $ checkComplexity isLogarithmic
+  , testProperty "Logarithmic" $ once $ checkComplexity isLogarithmic
     [(10,1.54191e-7),(15,1.7357e-7),(20,1.90191e-7),(30,2.20661e-7),(40,2.31167e-7),(61,2.55251e-7),(80,2.71941e-7),(122,2.97561e-7),(160,3.1158e-7),(244,3.38001e-7),(320,3.50998e-7),(488,3.7589e-7),(640,3.93221e-7),(976,4.15118e-7),(1280,4.30965e-7),(1953,4.5525e-7),(2560,4.70494e-7),(3906,4.98164e-7),(5120,5.1214e-7),(7812,5.50508e-7),(10240,5.51175e-7),(15625,5.75977e-7),(20480,5.98614e-7),(31250,6.14841e-7),(40960,6.32332e-7),(62500,6.60092e-7),(81920,6.67221e-7),(125000,6.94264e-7),(163840,7.08961e-7),(250000,7.3384e-7),(327680,7.48206e-7),(500000,7.75123e-7),(655360,7.90332e-7),(1000000,8.12204e-7)]
-  , testProperty "Logarithmic2" $ checkComplexity isLogarithmic2
+  , testProperty "Logarithmic2" $ once $ checkComplexity isLogarithmic2
     [(10,3.2606e-7),(15,4.41324e-7),(20,5.44409e-7),(30,6.84828e-7),(40,8.1833e-7),(61,1.017501e-6),(80,1.155663e-6),(122,1.376089e-6),(160,1.527048e-6),(244,1.783776e-6),(320,1.963467e-6),(488,2.255293e-6),(640,2.482833e-6),(976,2.813505e-6),(1280,2.995748e-6),(1953,3.392042e-6),(2560,3.609635e-6),(3906,4.011062e-6),(5120,4.266189e-6),(7812,4.679779e-6),(10240,4.963383e-6),(15625,5.409899e-6),(20480,5.70888e-6),(31250,6.266229e-6),(40960,6.554699e-6),(62500,7.130075e-6),(81920,7.429367e-6),(125000,7.953335e-6),(163840,8.318951e-6),(250000,8.901232e-6),(327680,9.295489e-6),(500000,9.926727e-6),(655360,1.034403e-5),(1000000,1.0997949e-5)]
-  , testProperty "Logarithmic6" $ checkComplexity isLogarithmic6
+  , testProperty "Logarithmic6" $ once $ checkComplexity isLogarithmic6
     [(10,8.628924e-6),(15,2.2718701e-5),(20,4.1468945e-5),(30,8.90083e-5),(40,1.44395898e-4),(61,2.76677148e-4),(80,4.07342187e-4),(122,7.0664375e-4),(160,9.83112109e-4),(244,1.594223437e-3),(320,2.119596093e-3),(488,3.235329687e-3),(640,4.227651562e-3),(976,6.111234375e-3),(1280,7.672078125e-3),(1953,1.08728375e-2),(2560,1.344470625e-2),(3906,1.8441325e-2),(5120,2.2353e-2),(7812,2.97963125e-2),(10240,3.5516875e-2),(15625,4.6447275e-2),(20480,5.477735e-2),(31250,7.038505e-2),(40960,8.21456e-2),(62500,0.10381915),(81920,0.1200662),(125000,0.1495741),(163840,0.1715495),(250000,0.2110635),(327680,0.2401788),(500000,0.2922768),(655360,0.3303902),(1000000,0.3993154)]
-  , testProperty "Sqrt" $ checkComplexity isSqrt
+  , testProperty "Sqrt" $ once $ checkComplexity isSqrt
     [(10,9.179e-9),(15,9.129e-9),(20,9.721e-9),(30,1.0412e-8),(40,1.0851e-8),(61,1.1441e-8),(80,1.2102e-8),(122,1.3903e-8),(160,1.4497e-8),(244,1.6241e-8),(320,1.746e-8),(488,2.0412e-8),(640,2.2189e-8),(976,2.5812e-8),(1280,2.7865e-8),(1953,3.3284e-8),(2560,3.5825e-8),(3906,4.7608e-8),(5120,5.3362e-8),(7812,6.3584e-8),(10240,7.0786e-8),(15625,8.4566e-8),(20480,9.4943e-8),(31250,1.13772e-7),(40960,1.29419e-7),(62500,1.56251e-7),(81920,1.76977e-7),(125000,2.16214e-7),(163840,2.46864e-7),(250000,3.01931e-7),(327680,3.43224e-7),(500000,4.24035e-7),(655360,4.80871e-7),(1000000,5.90708e-7)]
-  , testProperty "Linear" $ checkComplexity isLinear
+  , testProperty "Linear" $ once $ checkComplexity isLinear
     [(10,1.2137e-8),(19,1.7499e-8),(20,1.8083e-8),(39,2.849e-8),(40,2.9045e-8),(78,5.6604e-8),(80,5.7759e-8),(156,1.01422e-7),(160,1.03728e-7),(312,1.9109e-7),(320,1.962e-7),(625,3.73153e-7),(640,3.81767e-7),(1250,7.34564e-7),(1280,7.49969e-7),(2500,1.469915e-6),(2560,1.505307e-6),(5000,2.896041e-6),(5120,2.967195e-6),(10000,5.777413e-6)]
-  , testProperty "Linearithmic" $ checkComplexity isLinearithmic
+  , testProperty "Linearithmic" $ once $ checkComplexity isLinearithmic
     [(10,2.2405e-8),(19,4.8021e-8),(20,5.0446e-8),(39,9.8831e-8),(40,1.02064e-7),(78,2.13687e-7),(80,2.20389e-7),(156,4.71726e-7),(160,5.15425e-7),(312,1.094096e-6),(320,1.141173e-6),(625,2.407279e-6),(640,2.426035e-6),(1250,5.195858e-6),(1280,5.407168e-6),(2500,1.1405377e-5),(2560,1.1602465e-5),(5000,2.4561621e-5),(5120,2.5307434e-5),(10000,5.5566052e-5)]
-  , testProperty "Linearithmic2" $ checkComplexity isLinearithmic2
+  , testProperty "Linearithmic2" $ once $ checkComplexity isLinearithmic2
     [(10,4.7181e-8),(19,1.12792e-7),(20,1.22449e-7),(39,3.20318e-7),(40,3.32249e-7),(78,8.75328e-7),(80,9.04648e-7),(156,2.329658e-6),(160,2.419274e-6),(312,6.00791e-6),(320,6.189526e-6),(625,1.5036761e-5),(640,1.5424169e-5),(1250,3.6494995e-5),(1280,3.7753466e-5),(2500,8.7988085e-5),(2560,9.1063623e-5),(5000,2.09651562e-4),(5120,2.13942675e-4),(10000,4.88197265e-4)]
-  , testProperty "Quadratic" $ checkComplexity isQuadratic
+  , testProperty "Quadratic" $ once $ checkComplexity isQuadratic
     [(10,6.9102e-8),(15,1.41744e-7),(20,2.42625e-7),(31,5.7397e-7),(40,9.56442e-7),(62,2.248535e-6),(80,3.740179e-6),(125,9.10119e-6),(160,1.4752551e-5),(250,3.5977856e-5),(320,5.9150854e-5),(500,1.44069628e-4),(640,2.36670605e-4),(1000,5.76093359e-4)]
-  , testProperty "Quadrithmic4" $ checkComplexity isQuadrithmic4
+  , testProperty "Quadrithmic4" $ once $ checkComplexity isQuadrithmic4
     [(5,3.5023e-8),(9,1.59489e-7),(10,2.12688e-7),(19,1.627995e-6),(20,1.919146e-6),(39,1.5753015e-5),(40,1.704226e-5),(78,1.25921337e-4),(80,1.35570312e-4),(156,9.08977343e-4),(160,9.75295703e-4),(312,6.07931875e-3),(320,6.496996875e-3),(625,3.86003e-2),(640,4.0853375e-2),(1250,0.2314005),(1280,0.2456381),(2500,1.339004),(2560,1.4231234),(5000,7.528904)]
-  , testProperty "Cubic" $ checkComplexity isCubic
+  , testProperty "Cubic" $ once $ checkComplexity isCubic
     [(10,5.98066e-7),(11,7.7601e-7),(20,4.609741e-6),(23,6.99185e-6),(40,3.6676177e-5),(46,5.5854089e-5),(80,2.92877148e-4),(93,4.66834472e-4),(160,2.344111718e-3),(187,3.740370312e-3),(320,1.8751396875e-2),(375,3.018281875e-2),(640,0.150031325),(750,0.2414234),(1280,1.1982404),(1500,1.9280254),(2560,9.5926602),(3000,15.4408018)]
-  , testProperty "Quartic" $ checkComplexity isQuartic
+  , testProperty "Quartic" $ once $ checkComplexity isQuartic
     [(5,1.6603e-8),(7,3.0392e-8),(10,9.1955e-8),(15,3.25706e-7),(20,9.76705e-7),(31,5.34298e-6),(40,1.472517e-5),(62,8.4625488e-5),(80,2.34295019e-4),(125,1.395396875e-3),(160,3.74655e-3),(250,2.23739875e-2),(320,6.0027625e-2),(500,0.357446),(640,0.9591132),(1000,5.725087)]
 
-  , testProperty "Karatsuba" $ checkComplexity isKaratsuba
+  , testProperty "Karatsuba" $ once $ checkComplexity isKaratsuba
     [(10,4.8364e-8),(12,6.0228e-8),(20,9.9186e-8),(24,1.21309e-7),(40,2.31972e-7),(48,2.9911e-7),(80,6.2843e-7),(97,8.46736e-7),(160,1.846619e-6),(195,2.503655e-6),(320,5.42057e-6),(390,7.376403e-6),(640,1.6124441e-5),(781,2.2078021e-5),(1280,4.8210919e-5),(1562,6.6098962e-5),(2560,1.44684423e-4),(3125,1.98921875e-4),(5120,4.34806054e-4),(6250,5.9602539e-4),(10240,1.301581445e-3),(12500,1.784770312e-3),(20480,3.903389843e-3),(25000,5.354964062e-3),(40960,1.171065625e-2),(50000,1.604174375e-2),(81920,3.509155625e-2),(100000,4.82393125e-2)]
-  , testProperty "Strassen" $ checkComplexity isStrassen
+  , testProperty "Strassen" $ once $ checkComplexity isStrassen
     [(10,4.02343e-7),(11,5.14162e-7),(20,2.64022e-6),(23,3.884503e-6),(40,1.8058444e-5),(46,2.6682556e-5),(80,1.258875e-4),(93,1.92064208e-4),(160,8.8356914e-4),(187,1.362714843e-3),(320,6.163835937e-3),(375,9.710895312e-3),(640,4.32488375e-2),(750,6.8603265625e-2),(1280,0.30328925),(1500,0.4761277),(2560,2.1247246),(3000,3.3290002)]
 
-  , testProperty "Linear again" $ checkComplexity isLinear
+  , testProperty "Linear again" $ once $ checkComplexity isLinear
     [(1,6.9753e-8),(2,1.28492e-7),(4,2.46261e-7),(5,3.05419e-7),(8,4.82596e-7),(10,6.01227e-7)]
   ]
 
