XML_Transformer Debug Code

I have concerns about the debug code in XMl_Transformer. I was running an XML_Transform that takes about 1.5 seconds, so i started to look for places to optimize (XDebug's profiller wasn't much help btw because i couldn't seem to get it to give me any aggregate stats). Looking through the Transformer class i noticed that the debug code is always run its output is just ignored. By wrapping all the calls to $this->_debug() in if($this->_debug()) { i was able to save about .45 seconds. From my quick look this looks like a backwards compatible change so it would be a nice speed fix to roll out in the next release. In the end my main problem was having the transformer set for recursive operation when i didn't need it, but the fixing of needless calls to sprinf and XML_Transformer_Util::attributesToString you get a big speed fix for free. Let me know if you want a patch for this or if you have another solution. (one might be having a debug version of the class) thanks -joshua eichorn