JavaJones, Look, this was made for a simple demonstration, with low resolution frames in order to do the test fairly quickly. If there is a non-measurable overhead in those conditions I'm willing to live with it :) At real resolutions like 768 x 576 it would be even more negligible. Now that was for my network, it is perfectly possible that the overhead is not negligible with other configurations. If the HyperVue render manager is slow, it might have problems to compute as a rendercow and send all the information to all the cows. That's why having a SMP PC as the manager is a plus. If anyone do the same kind of test I am of course interested to see the results.