SharpGL has not been updated for a while, the original CoreProject article is at:

Recently I have begun work on SharpGL 2.0, with plans to address some of the issues people have had with SharpGL 1.83. In preparation there is a public accessible repository on CodePlex: check it soon, it will shortly be online.

Trying to squeeze acceptible performance from SharpGL has so far been an interesting task, I have found out many interesting things on the way, I'll be posting small snippets as I work on SharpGL 2.0 describing how I'm improving the performance and structure of the library.