tried to identify slowdown - possible 'foldl (++) graphlist' causing much GC-activity in the long-run

dist/build/autogen/Paths_hgraph.hs

@@ -1,7 +1,7 @@
 module Paths_hgraph (
     version,
     getBinDir, getLibDir, getDataDir, getLibexecDir,
-    getDataFileName, getSysconfDir
+    getDataFileName
   ) where
 
 import qualified Control.Exception as Exception
@@ -15,20 +15,18 @@ catchIO = Exception.catch
 
 version :: Version
 version = Version {versionBranch = [0,0,1], versionTags = []}
-bindir, libdir, datadir, libexecdir, sysconfdir :: FilePath
+bindir, libdir, datadir, libexecdir :: FilePath
 
 bindir     = "/home/sdressel/.cabal/bin"
-libdir     = "/home/sdressel/.cabal/lib/x86_64-linux-ghc-7.6.3/hgraph-0.0.1"
-datadir    = "/home/sdressel/.cabal/share/x86_64-linux-ghc-7.6.3/hgraph-0.0.1"
+libdir     = "/home/sdressel/.cabal/lib/hgraph-0.0.1/ghc-7.6.3"
+datadir    = "/home/sdressel/.cabal/share/hgraph-0.0.1"
 libexecdir = "/home/sdressel/.cabal/libexec"
-sysconfdir = "/home/sdressel/.cabal/etc"
 
-getBinDir, getLibDir, getDataDir, getLibexecDir, getSysconfDir :: IO FilePath
+getBinDir, getLibDir, getDataDir, getLibexecDir :: IO FilePath
 getBinDir = catchIO (getEnv "hgraph_bindir") (\_ -> return bindir)
 getLibDir = catchIO (getEnv "hgraph_libdir") (\_ -> return libdir)
 getDataDir = catchIO (getEnv "hgraph_datadir") (\_ -> return datadir)
 getLibexecDir = catchIO (getEnv "hgraph_libexecdir") (\_ -> return libexecdir)
-getSysconfDir = catchIO (getEnv "hgraph_sysconfdir") (\_ -> return sysconfdir)
 
 getDataFileName :: FilePath -> IO FilePath
 getDataFileName name = do