Interestingly enough, the first live.com hit for the "XslCompiledTransform Performance" query at the moment is this post of Jeff Prosise, where he says he was disappointed that XslCompiledTransform ran just 3 times faster than XslTransform on a "fairly simple style sheet". He is concerned that XslCompiledTransform is not fast enough comparing to the good old MSXML 4.0. Well, as we will see very soon, XslCompiledTransform may easily outperform MSXML 4.0 by several times!
XslCompiledTransform
XslTransform
System.Xml.Xsl.XslCompiledTransform