diff --git a/examples/osgimagesequence/osgimagesequence.cpp b/examples/osgimagesequence/osgimagesequence.cpp
index dccf15b1c..1109713b7 100644
--- a/examples/osgimagesequence/osgimagesequence.cpp
+++ b/examples/osgimagesequence/osgimagesequence.cpp
@@ -104,7 +104,11 @@ int main(int argc, char **argv)
     // create a model from the images and pass it to the viewer.
     viewer.setSceneData(createModel());
 
-    //osgDB::writeNodeFile(*viewer.getSceneData(),"test.osg");
+    std::string filename;
+    if (arguments.read("-o",filename))
+    {
+        osgDB::writeNodeFile(*viewer.getSceneData(),filename);
+    }
 
     return viewer.run();
 }
diff --git a/include/osg/ImageSequence b/include/osg/ImageSequence
index a59c91d98..49a825620 100644
--- a/include/osg/ImageSequence
+++ b/include/osg/ImageSequence
@@ -51,7 +51,7 @@ class OSG_EXPORT ImageSequence : public ImageStream
         typedef std::list< osg::ref_ptr<osg::Image> >   Images;
         typedef std::list< std::string >                FileNames;
 
-        void setDuration(double duration) { _duration = duration; }
+        void setDuration(double duration);
         double getDuration() const { return _duration; }
 
         void setPruneOldImages(bool prune) { _pruneOldImages = prune; }
@@ -80,6 +80,8 @@ class OSG_EXPORT ImageSequence : public ImageStream
         virtual ~ImageSequence() {}
         
         void setImageToChild(const osg::Image* image);
+        
+        void computeTimePerImage();
 
         double                          _referenceTime;
         double                          _timeMultiplier;
@@ -89,6 +91,8 @@ class OSG_EXPORT ImageSequence : public ImageStream
         
         double                          _duration;
         bool                            _pruneOldImages;
+
+        double                          _timePerImage;
         
         double                          _imageHeadTime;
         Images                          _images;
diff --git a/src/osg/ImageSequence.cpp b/src/osg/ImageSequence.cpp
index 95d780370..beba1ff5a 100644
--- a/src/osg/ImageSequence.cpp
+++ b/src/osg/ImageSequence.cpp
@@ -42,6 +42,7 @@ ImageSequence::ImageSequence()
     _timeMultiplier = 1.0;
 
     _duration = 1.0;
+    _timePerImage = 1.0;
     _pruneOldImages = false;
 
     _imageIteratorTime = DBL_MAX;
@@ -64,16 +65,31 @@ int ImageSequence::compare(const Image& rhs) const
     return ImageStream::compare(rhs);
 }
 
+void ImageSequence::setDuration(double duration)
+{
+    _duration = duration;
+    computeTimePerImage();
+}
+
+void ImageSequence::computeTimePerImage()
+{
+    if (!_fileNames.empty()) _timePerImage = _duration / double(_fileNames.size());
+    else if (!_images.empty()) _timePerImage = _duration / double(_images.size());
+    else _timePerImage = _duration;
+}
+
 void ImageSequence::addImageFile(const std::string& fileName)
 {
     OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_mutex);
     _fileNames.push_back(fileName);
+    computeTimePerImage();
 }
 
 void ImageSequence::addImage(osg::Image* image)
 {
     OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_mutex);
     _images.push_back(image);
+    computeTimePerImage();
 
     if (_imageIterator==_images.end())
     {
@@ -115,9 +131,6 @@ void ImageSequence::update(osg::NodeVisitor* nv)
     }
     
     double time = (fs->getSimulationTime() - _referenceTime)*_timeMultiplier;
-    double delta = _fileNames.empty() ?
-            _duration / _images.size() : 
-            _duration / _fileNames.size();
             
     Images::iterator previous_imageIterator = _imageIterator;
     
@@ -126,14 +139,20 @@ void ImageSequence::update(osg::NodeVisitor* nv)
     if (_imageIterator!=_images.end())
     {
         // osg::notify(osg::NOTICE)<<"   _imageIteratorTime = "<<_imageIteratorTime<<std::endl;
-        while(time > (_imageIteratorTime + delta))
+        while(time > (_imageIteratorTime + _timePerImage))
         {
-            _imageIteratorTime += delta;
+            _imageIteratorTime += _timePerImage;
             // osg::notify(osg::NOTICE)<<"   _imageIteratorTime = "<<_imageIteratorTime<<std::endl;
             ++_imageIterator;
             
             if (_imageIterator ==_images.end())
             {
+
+                if (_pruneOldImages)
+                {
+                    _images.erase(previous_imageIterator, _imageIterator);
+                }
+
                 // return iterator to begining of set.            
                 _imageIterator = _images.begin();
             }
@@ -147,6 +166,11 @@ void ImageSequence::update(osg::NodeVisitor* nv)
     
     if (_imageIterator!=_images.end() && previous_imageIterator != _imageIterator)
     {
+        if (_pruneOldImages)
+        {
+            _images.erase(previous_imageIterator, _imageIterator);
+        }
+    
         setImageToChild(_imageIterator->get());
     }
 }
diff --git a/src/osgPlugins/osg/ImageSequence.cpp b/src/osgPlugins/osg/ImageSequence.cpp
index 41c672081..fe8e736a1 100644
--- a/src/osgPlugins/osg/ImageSequence.cpp
+++ b/src/osgPlugins/osg/ImageSequence.cpp
@@ -27,6 +27,14 @@ bool ImageSequence_readLocalData(Object& obj, Input& fr)
 
     ImageSequence& is = static_cast<ImageSequence&>(obj);
 
+    unsigned int numFilesToPreLoad = 1;
+
+    double duration;
+    if (fr.read("Duration", duration))
+    {
+        is.setDuration(duration);
+    }
+    
     if (fr.matchSequence("FileNames {"))
     {
         fr += 2;
@@ -36,12 +44,13 @@ bool ImageSequence_readLocalData(Object& obj, Input& fr)
         {
             if (fr[0].getStr())
             {
-#if 1
                 is.addImageFile(fr[0].getStr());
-#else                           
-                osg::ref_ptr<osg::Image> image = fr.readImage(fr[0].getStr());
-                if (image.valid()) is.addImage(image.get());
-#endif
+
+                if (is.getImages().size() < numFilesToPreLoad)
+                {
+                    osg::ref_ptr<osg::Image> image = fr.readImage(fr[0].getStr());
+                    if (image.valid()) is.addImage(image.get());
+                }
             }
             ++fr;
         }
@@ -74,6 +83,8 @@ bool ImageSequence_writeLocalData(const Object& obj, Output& fw)
     // no current image writing code here 
     // as it is all handled by osg::Registry::writeImage() via plugins.
     
+    fw.indent()<<"Duration "<<is.getDuration()<<std::endl;
+    
     if (!is.getFileNames().empty())
     {
         fw.indent()<<"FileNames {"<<std::endl;