My XSLT was compiled via xsltc, the performance is hugely improved. However, I am wondering how the compiled XSLT works on IIS? Will there any cached of the compiled XSLT instance on the IIS after 1st JIT'ing. As I am seeing my page slightly slow in response from server, but if the page after being called once, subsequent access to the page will faster. So I am suspecting all the transformation processes was not cached for long time on server side.