I have not yet managed to setup a single local recursor, such as PowerDNS recursor, to deliver the same performance as the list consisting of multiple open resolvers, although bandwidth does not seem to be the limiting factor. Testing with dnsperf, the best result I am currently getting is about 6,000 resolves per second with bind, for PDNS the figure is even lower for some reason. I will have to dig a bit deeper in order to find the reason for that cap.