diff --git a/dev.hs b/dev.hs
new file mode 100644
index 000000000..281cd7333
--- /dev/null
+++ b/dev.hs
@@ -0,0 +1,64 @@
+-- dev.hs, for miscellaneous profiling/benchmarking/testing.
+
+import Hledger.Utils.Debug
+-- import System.Environment (getArgs)
+import Control.Monad.Except
+import Criterion.Main
+-- import Data.Text.Lazy as LT
+-- import System.Environment
+-- import Hledger
+-- import qualified Hledger.Read.JournalReader as JR
+import qualified Hledger.Read.TimelogReader as TR
+-- import qualified Hledger.Read.TimelogReaderNoJU as TRNOJU
+-- import qualified Hledger.Read.TimelogReaderPP as TRPP
+
+inputjournal = "data/10000x1000x10.journal"
+inputtimelog = "data/sample.timelog"
+
+main = do
+  --  
+
+  -- -- read the input journal
+  -- j <- either error id <$> readJournalFile Nothing Nothing True inputfile
+  -- -- sanity check we parsed it all
+  -- putStrLn $ show $ length $ jtxns j
+
+  -- benchmark timelog parsing
+  -- s <- readFile inputtimelog
+  -- putStrLn $ show $ length s
+  -- let s = unlines [
+  --       "i 2009/03/27 09:00:00 projects:a",
+  --       "o 2009/03/27 17:00:34",
+  --       "i 2009/03/31 22:21:45 personal:reading:online",
+  --       "o 2009/04/01 02:00:34",
+  --       "i 2009/04/02 09:00:00 projects:b",
+  --       "o 2009/04/02 17:00:34"
+  --      ]
+  -- -- let output = return . const -- putStrLn.show
+
+  -- -- withArgs ["-l"] $ defaultMain [bench "timelog polyparse" $ nfIO $ runExceptT $ TRPP.parseJournalWith' TRPP.timelogFile False "" s]
+  -- defaultMain [
+  --   -- bench ("read "++inputtimelog++" with parsec") $ nfIO $ runExceptT (TR.parse Nothing False "" s) >>= output
+  --   -- bench ("read "++inputtimelog++" with parsec, no ju") $ nfIO $ runExceptT (TRNOJU.parse Nothing False "" s) >>= output,
+  --   -- bench ("read "++inputtimelog++" polyparse")   $ nfIO $ runExceptT (TRPP.parse Nothing False "" s) >>= output
+  --   ]
+
+  -- return ()
+
+-- benchWithTimeit = do
+--   getCurrentDirectory >>= printf "Benchmarking hledger in %s with timeit\n"
+--   let opts = defcliopts{output_file_=Just outputfile}
+--   (t0,j) <- timeit ("read "++inputfile) $ either error id <$> readJournalFile Nothing Nothing True inputfile
+--   (t1,_) <- timeit ("print") $ print' opts j
+--   (t2,_) <- timeit ("register") $ register opts j
+--   (t3,_) <- timeit ("balance") $ balance  opts j
+--   (t4,_) <- timeit ("stats") $ stats opts j
+--   printf "Total: %0.2fs\n" (sum [t0,t1,t2,t3,t4])
+
+-- timeit :: String -> IO a -> IO (Double, a)
+-- timeit name action = do
+--   printf "%s%s" name (replicate (40 - length name) ' ')
+--   (t,a) <- timeItT action
+--   printf "[%.2fs]\n" t
+--   return (t,a)
+