diff --git a/CONTRIBUTORS b/CONTRIBUTORS
index f4a667fc..d80adb5c 100644
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -3316,6 +3316,7 @@ Thomas Reufer <thomas@reufer.ch>
  for adding detection of 24fps
  for suggesting to add some comment to cPixmap about the relation between OSD,
  ViewPort and DrawPort
+ for suggesting to reduce the priority of the "video directory scanner" thread
 
 Eike Sauer <EikeSauer@t-online.de>
  for reporting a problem with channels that need more than 5 TS packets for detecting
diff --git a/HISTORY b/HISTORY
index 13d450d6..e4703349 100644
--- a/HISTORY
+++ b/HISTORY
@@ -8596,7 +8596,7 @@ Video Disk Recorder Revision History
 - Bumped all version numbers to 2.2.0.
 - Official release.
 
-2015-03-25: Version 2.3.1
+2015-04-11: Version 2.3.1
 
 - The new function cOsd::MaxPixmapSize() can be called to determine the maximum size
   a cPixmap may have on the current OSD. The 'osddemo' example has been modified
@@ -8620,3 +8620,5 @@ Video Disk Recorder Revision History
   (suggested by Thomas Reufer).
 - Improved syncing on sections when parsing the NIT and SDT.
 - Fixed scaling subtitles (their areas could sometimes extend outside the actual OSD).
+- Reduced the priority of the "video directory scanner" thread (suggested by Thomas
+  Reufer) and checking cIoThrottle::Engaged() when it is running.
diff --git a/recording.c b/recording.c
index 0a084140..0164bb97 100644
--- a/recording.c
+++ b/recording.c
@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: recording.c 3.28 2015/02/16 07:49:14 kls Exp $
+ * $Id: recording.c 4.1 2015/04/11 10:44:38 kls Exp $
  */
 
 #include "recording.h"
@@ -1367,7 +1367,7 @@ cRecordings Recordings;
 char *cRecordings::updateFileName = NULL;
 
 cRecordings::cRecordings(bool Deleted)
-:cThread("video directory scanner")
+:cThread("video directory scanner", true)
 {
   deleted = Deleted;
   initial = true;
@@ -1412,6 +1412,8 @@ bool cRecordings::ScanVideoDir(const char *DirName, bool Foreground, int LinkLev
   cReadDir d(DirName);
   struct dirent *e;
   while ((Foreground || Running()) && (e = d.Next()) != NULL) {
+        if (!Foreground && cIoThrottle::Engaged())
+           cCondWait::SleepMs(100);
         cString buffer = AddDirectory(DirName, e->d_name);
         struct stat st;
         if (lstat(buffer, &st) == 0) {