I haven't done any formal performance test yet. What type of
application are you planning to develop? in theory you shouldn't
notice any difference for most applications. The only thing I noticed
between the Java version and the C# version is that the C# version
uses a little bit more CPU for applications that use a lot of graphics
and animation (i.e. Colliding Mice example). Other than that starting
times, memory consumption, responsiveness you can't notice any
difference and even CPU usage for apps that don't use extensive
graphics and animation is the same. But it will be good to make some
formal tests.
David.