The variables for anyone in no particular order are likely to be:
1. Configuration and optimisation of ones server.
2. Efficiency of ones code.
3. Connectivity to Nominet. Nominet peer via Linx and Lonap. One could get an AS number, a PI block from RIPE, find an ISP to be your LIR, join Lonap (£2,000 a year), peer with Nominet, buy an enterprise router and switch and a couple of servers, get some colo space in the required data centre (possibly THN or THE) and plug the lonap connection directly into the machine running the drop catching code. That way one would truly be one hop from Nominet's border router without any other routers in the way.
4. Number of DAC's (and EPP's) you can host and utilise together, as well as get away with, to cover the 24 hour period.
Nominet's systems do evolve, and ones code has to be kept in shape, but simply put one memberships resource cannot compete against the combined resources of more than one membership. No amount of obfuscation of this by anyone will persuade me otherwise I am afraid.
*Anyone is entitled *to ask questions but if you want to ask them I feel you should rightly be asking Nominet. If you believe or suspect something isn't fair or correct, suggest it in an email (
[email protected]) to Nominet and they're obliged to look into it. If you believe someone is making use of combined resources then stick your views in an email, *including the tags and caught domain names you want Nominet to investigate* and I am sure they will do so. They should be smart enough to work out: which DAC and EPP IP addresses might be linked to the same operation, if someone was pooling multiple membership DAC allowances with one EPP connection, or if someone was using a different membership DAC allowance but not the EPP connection, or vice versa, at a particular time in the day. If, after all of this, you still think someone is doing far better than you then look at my list numbered 1-4 and impliment whatever makes you feel happy.