'I may be mistaken, but I believe the reporting on that site is incorrect. The entire pool hashrate (40+GH) is effectively applied to the network, on each chain, when work is submitted under merge mining. Therefore 40GH is actually present on Dirac from that pool.

On my pool in testing, with two users, we are seeing an average of 25GH. Thus, in 'public' (known) pools there is 65GH. Solo mining the network is possible at this point even with one GPU/FPGA.