Earlier quoted context omitted.
curious about the performance issue. Would the impact on performance be larger than a similarly sized block list in a browser plugin? I have a netbook, so always want to keep an eye out on performance. I wonder if there's a GUI application which enables these hosts sources to be tweaked, searched, whitelisted etc
I use this on Windows. For a large hosts file (several megabytes), I find the DNS client service hangs until it reads the whole file. Further, there is also a noticeable delay in the order of a few seconds until the hostname is resolved. For smaller files, I find there is no noticeable lag. Can't offer you any numbers though. Hostsman ( http://www.abelhadigital.com/hostsman ) on windows is the my choice of a frontend…
The solution is to feed the data to a DNS caching resolver such as unbound or dnsmasq, as I have explained in reply to UserRights.
Answering here also to point out I originally implemented this on a 5y old netbook (Atom CPU, 1GB RAM) because I tend to have a lot of tabs open in firefox, and ABP's memory usage quickly becomes noticeable, and then comes the swapping. Running unbound+nginx scales remarquably well, without hogging too much memory at startup. (Sorry, I don't have access to the netbook right now to report real numbers).