You probably use one of the faster ways to build large results (see my reply to R. Strahl for 2 typical ways), but it still might be a good idea to check if your code cannot be speeded up with tools inherent to the runtime. If you cannot post the code, perhaps by describing the base working and when/how slowdowns occur we can see something overlooked.

regards
thomas

>Would it be an idea to first implement the class with the typical read/write functions and do the string manipulations later? For my purpose I would need the read/write to 95%, while the others are going to be exceptions. That would also give a proof of concept early on, so you can be sure you are on the right track.
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>I would like to compare the writer with the code I am using now to create a fairly large XML file. I am curious what the actual difference will be.