I am not upset at all :) Your concerns are certainly valid. As I test hardware and software for a living, I have no problem to agree with you on the subject of benchmarking. But this experiment was an informal one, done to provide some information to the community, but not designed to be extrapolated to every setup nor seen in a scientific way. The 'negligible overhead' means that, in my case, I have never been bothered by it, with small images or with high-resolution frames and 30 minutes per frame. That does not mean that overhead doesn't exist of course, only that I do not see it as annoying. I see 'annoying overhead' when experimenting with distant network rendering. Sending large scenes across the internet to distant computers takes a looong time. But sending scenes and textures and getting back the data across a gigabit network takes a negligible time compared to rendering those large scenes, that's what I think is the most important thing :)