Reflection.Emit or Pre-compiled Lambda Expression for PropertyDescriptor.SetValue/PropertyDescriptor.GetValue

Hi,

I have a library where I make these calls:
PropertyDescriptor.SetValue() and PropertyDescriptor.GetValue(). 

because I don't know the properties before run-time, and the properties are added on demand, usingTypeDescriptor.
The problem is that these calls are really slow. How do I emit these call with Reflection Emit (using IL directly), or use  Pre-compiled Lambda Expression to cache method delegate for these calls ?

Thanks in advance.