diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,3 +1,7 @@
+## 3.0.13
+
+* Turn off file descriptor cache by default [#371](https://github.com/yesodweb/wai/issues/371)
+
 ## 3.0.12.1
 
 * Fix for: HEAD requests returning non-empty entity body [#369](https://github.com/yesodweb/wai/issues/369)
diff --git a/Network/Wai/Handler/Warp.hs b/Network/Wai/Handler/Warp.hs
--- a/Network/Wai/Handler/Warp.hs
+++ b/Network/Wai/Handler/Warp.hs
@@ -184,7 +184,17 @@
 setManager :: Manager -> Settings -> Settings
 setManager x y = y { settingsManager = Just x }
 
--- | Cache duration time of file descriptors in seconds. 0 means that the cache mechanism is not used. Default value: 10
+-- | Cache duration time of file descriptors in seconds. 0 means that the cache mechanism is not used.
+--
+-- The FD cache is an optimization that is useful for servers dealing with
+-- static files. However, if files are being modified, it can cause incorrect
+-- results in some cases. Therefore, we disable it by default. If you know that
+-- your files will be static or you prefer performance to file consistency,
+-- it's recommended to turn this on; a reasonable value for those cases is 10.
+-- Enabling this cache results in drastic performance improvement for file
+-- transfers.
+--
+-- Default value: since 3.0.13, default value is 0, was previously 10
 setFdCacheDuration :: Int -> Settings -> Settings
 setFdCacheDuration x y = y { settingsFdCacheDuration = x }
 
diff --git a/Network/Wai/Handler/Warp/Settings.hs b/Network/Wai/Handler/Warp/Settings.hs
--- a/Network/Wai/Handler/Warp/Settings.hs
+++ b/Network/Wai/Handler/Warp/Settings.hs
@@ -45,7 +45,7 @@
     , settingsOnClose :: SockAddr -> IO ()  -- ^ What to do when a connection is close. Default: do nothing.
     , settingsTimeout :: Int -- ^ Timeout value in seconds. Default value: 30
     , settingsManager :: Maybe Manager -- ^ Use an existing timeout manager instead of spawning a new one. If used, 'settingsTimeout' is ignored. Default is 'Nothing'
-    , settingsFdCacheDuration :: Int -- ^ Cache duratoin time of file descriptors in seconds. 0 means that the cache mechanism is not used. Default value: 10
+    , settingsFdCacheDuration :: Int -- ^ Cache duratoin time of file descriptors in seconds. 0 means that the cache mechanism is not used. Default value: 0
     , settingsBeforeMainLoop :: IO ()
       -- ^ Code to run after the listening socket is ready but before entering
       -- the main event loop. Useful for signaling to tests that they can start
@@ -108,7 +108,7 @@
     , settingsOnClose = const $ return ()
     , settingsTimeout = 30
     , settingsManager = Nothing
-    , settingsFdCacheDuration = 10
+    , settingsFdCacheDuration = 0
     , settingsBeforeMainLoop = return ()
     , settingsFork = void . forkIOWithUnmask
     , settingsNoParsePath = False
diff --git a/warp.cabal b/warp.cabal
--- a/warp.cabal
+++ b/warp.cabal
@@ -1,5 +1,5 @@
 Name:                warp
-Version:             3.0.12.1
+Version:             3.0.13
 Synopsis:            A fast, light-weight web server for WAI applications.
 License:             MIT
 License-file:        LICENSE