diff --git a/examples/mini/Cache.hs b/examples/mini/Cache.hs
--- a/examples/mini/Cache.hs
+++ b/examples/mini/Cache.hs
@@ -6,6 +6,8 @@
 import Text.XML.HXT.Cache
 import Codec.Compression.BZip (compress, decompress)
 
+import System
+
 main = runX ( readDocument [ withParseHTML yes
                            , withWarnings no
                            , withRemoveWS yes
@@ -13,10 +15,13 @@
                                                                         -- documents remain valid 10 seconds (for testing)
                                                                         -- no 404 documents are cached
                            , withCompression (compress, decompress)     -- the cached files will be BZip compressed
+                           , withStrictDeserialize yes                  -- cache file will be read and closed immediatly
                            , withTrace 2
                            , withCurl []                                -- curl is taken for HTTP access
                            ] "http://www.fh-wedel.de/"
               >>>
+--              perform (arrIO0 $ system "/usr/bin/lsof")
+--              >>>
               processChildren (hasName "html" /> hasName "body" //> isText)
               >>>
               writeDocument [] ""
diff --git a/hxt-cache.cabal b/hxt-cache.cabal
--- a/hxt-cache.cabal
+++ b/hxt-cache.cabal
@@ -1,5 +1,5 @@
 Name:           hxt-cache
-Version:        9.0.0
+Version:        9.0.1
 Synopsis:       Cache for HXT XML Documents and other binary data
 Description:    Extension for caching XML documents and other binary data in cache directory
                 of the local filesystem.
@@ -25,7 +25,9 @@
   Control.Concurrent.ResourceTable
 
  hs-source-dirs: src
+
  ghc-options: -Wall
+ ghc-prof-options: -auto-all -caf-all
 
  build-depends: base       >= 4   && < 5,
                 bytestring >= 0.9 && < 1,
diff --git a/src/Text/XML/HXT/Arrow/XmlCache.hs b/src/Text/XML/HXT/Arrow/XmlCache.hs
--- a/src/Text/XML/HXT/Arrow/XmlCache.hs
+++ b/src/Text/XML/HXT/Arrow/XmlCache.hs
@@ -59,7 +59,7 @@
 -- When the cache is configured and enabled, every document read and parsed is serialized and stored in binary
 -- form in the cache. When reading the same document again, it is just deserialized, no parsing is performed.
 --
--- The cache is configured by a path pointing to a directory for storing the docuemnts,
+-- The cache is configured by a path pointing to a directory for storing the documents,
 -- by a maximal time span in second for valid documents. After that time span, the documents are read again
 -- and the cache is updated.
 -- The flag contols, whether documents returning 404 or other errors will be cached.
@@ -234,7 +234,7 @@
     readC cdir          = readCache' $ uncurry (</>) $ cacheFile cdir f
 
 readCache'              :: (NFData c, Binary c) => String -> IOStateArrow s b c
-readCache' cf           = withLock cf $ readBinaryValue cf
+readCache' cf           = rnfA $ withLock cf $ readBinaryValue cf
 
 writeCache              :: (Binary b) => String -> IOStateArrow s b ()
 writeCache f            = writeC $< getSysVar theCacheDir