Did you read the followup post to that? It looks like the difference is not as big as it seems, and it has many drawbacks.
Yes, I read that and the raster solution has big problems. Actually I would not consider that the way forwards. My biggest need is performance over LTSP via the X protocols. Zack's thoughts about OpenGL acceleration could well be the solution, as that works over X. Hope some solutions will be found.
Anyway, I'm getting off topic here. Sorry.
Kevin