[bind10-dev] recent performance improvements

[Jeremy C. Reed]

> But that slightly older BIND 10 version is faster than BIND 9 for some 
> scenarios:

(I scripted the math wrong, so sending again.)

builtin--.soa 7788.911525 qps 117% faster
builtin--.nxdomain 6627.428578 qps 102% faster
builtin--.success 27888.579103 qps 71% faster
smallzone-memory-cpus4.soa 80723.619440 qps 12% faster
smallzone-memory-cpus4.nxdomain 81356.850019 qps 10% faster
root-memory-cpus4.nxdomain 74938.834923 qps 4% faster

(But those were all slower in the later master.)