I'm using Lucene.Net along with snowball stemming to index text from a database. The class Lucene.Net.Analysis.Snowball.SnowballFilter uses the reflection API and the invoke method to call the stem methods of snowball. I have written a Snowball filter which creates a delegate and uses this delegate to stem the words afterwards. This approach improves the indexing speed of my indexing program by about 10%. I would be happy if you include this code into lucene.net.