Java watermarking write slow

I am writing a Java Application to provide a digitally watermarked on-the-fly solution for a high voulme product......here are a few details of my logs after deployment(all times are in milliseconds) and each set conforms to a completed request,
Set 1.
INFO - ImageSource.setImage(51) | Time taken:121
INFO - WatermarkEngine.doWatermarking(48) | Time taken:29
INFO - ImageSource.writeStream(62) | Time taken write:775
INFO - CarsalesAction.carsales(52) | Time taken:949
Set 2.
INFO - ImageSource.setImage(51) | Time taken:113
INFO - WatermarkEngine.doWatermarking(48) | Time taken:15
INFO - ImageSource.writeStream(62) | Time taken write:964
INFO - CarsalesAction.carsales(52) | Time taken:1118
Set 3.
INFO - ImageSource.setImage(51) | Time taken:133
INFO - WatermarkEngine.doWatermarking(48) | Time taken:15
INFO - ImageSource.writeStream(62) | Time taken write:800
INFO - CarsalesAction.carsales(52) | Time taken:972
As is obvious the bottleneck to performace is the Image write to the servletouputstream which is handled by the ImageIO class from the 2D library. For testing, I started writing files by reading them as streams from the file-system and found that the write performance increases manifold by using code similar to,
InputStream inFile = new FileInputStream(context.getFile().getAbsolutePath());
InputStream in = new BufferedInputStream(inFile);
while (true) {
int data = in.read();
if (data == -1) {
break;
os.write(data);
Clearly when the input stream is buffered while reading from disk, the performance is good. However I am dealing with a BufferedImage(an in-memory object) and a standard library ImageIO for write.....any tips on how this can be optimised would be most welcome?
Thanks

are all your io-operations buffered?That is the question essentially.....
ImageIO.write(context.getRequestedImage(),"jpeg",os);where os is a BufferedOutputStream......is this the best way of handling the situation....if it is I find it hard to understnad why a write on an in-memory object should be slower than a write from the file-system as I mentioned in the original post??.

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Java watermarking write slow

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