I have a moderately sized XSLT of about 1000 lines and 30 heavily re-entrant templates, which I typically run over 50-70 complex XML documents to produce a large consolidated report.
When I run it in Stylus Studio, with 'preview text' selected, I can frequently see points in its processing when there is no output to the XSLT preview pane for 2 to 3 seconds. But it's next to impossible to tell where in the XSLT the hold up might be.
Considering that this XSLT can take up to half an hour to run it would be really handy to have some basic profiling information available, such as total time spent in each template, total template call/application count, etc.