XSLT Transforming performance

Question

Here is links to my files XML, XSLT, Include XSLT

Hi

I am transforming xml into html. My xml file is about 10kb big and my xslt 70kb and output html about 10kb big.

Transformer xformer = StylesheetCache.newTransformer(templateFile);
xformer.transform(new DOMSource(outlineDoc),new StreamResult(out));

The creating of the transformer takes about 10s to create thats why i created cache that bring it down to 300ms if its cached. The transform line takes 3s to execute. Now is this long. I have written similar transforms on windows mobile and it execution time is about <=1s

I changed the TransformerFactory to Saxon but the result was about the same.

thanks

Answer 1

Are you experiencing such delays on each transformation? I've noticed that when it takes a while for Android to load the third-party libraries into the process. The exact time depends on the library size. For example loading joda-time takes approximately 3 seconds.

Answer 2

I found the problem... I think i need to kick myself. I was at home playing with my phone so i decided to play with the app a bit. and all of a sudden the init load was like 1s and subsequent calls like 500ms. So at this point i was stumped. i so pulled out my laptop plugged my phone in and debugged and all of a suddend it was 12s again. i was the freaking IDE. as soon as i run it through ecclipse it slows down to 12s.

:-\

Answer 3

You problem is with use of DOMSource, don't use it if at all possible. Saxon specifically has much worse performance compared to using a streaming source or SAX source -- this because it builds its own highly optimized (for xslt use) tree ("tiny tree"). There is a work-around to this problem as well as full explanation at: http://dev.saxonica.com/blog/mike/2007/03/#000138.

But even if you were using Xalan (JDK default), it makes sense to use raw input and not build intermediate DOM structure; XSLT processors can build optimal in-memory representation themselves and often more efficiently.