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ImageIO Performance

Hello. I have a Java 6 application that needs to run on Mac G5's (10.4.9 Using the Developer Preview 6). Everything seems to work fine - The only issue I'm having is that image loading performance is ridiculously slow.
I'm loading PNG images (no more than 1024x1024) from a byte array. On windows this takes around 70-80 ms. On mac, the same code takes 2.5-3 seconds. I've spent multiple hours browsing through mailing lists and have tried multiple solutions. Here is my current loading code:

[code]
PNGImageReader reader = new PNGImageReader( null );
reader.setInput( new MemoryCacheImageInputStream( new ByteArrayInputStream( previewImageData ) ) );
                  
BufferedImage img = new BufferedImage( reader.getWidth( 0 ), reader.getHeight( 0 ), BufferedImage.TYPE_INT_ARGB_PRE );
                   
ImageReadParam param = new ImageReadParam();
param.setDestination( img );     
                   
reader.read ( 0, param );
[/code]

If anyone has an idea or suggestion, I'm desperate for help. Could this poor performance be a result of using the developer preview? If I ported my application to java 5 would performance increase significantly?

Thanks for your help,
Jeff
 
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