There’s a good chance you’re using your ISP’s DNS at home, which is usually far worse than other offerings like Google’s DNS and OpenDNS. There is however, a new player in town; 18.104.22.168
We’ve built 22.214.171.124 to be the Internet’s fastest DNS directory. […] Since nearly everything you do on the Internet starts with a DNS request, choosing the fastest DNS directory across all your devices will accelerate almost everything you do online
I’ve been using 126.96.36.199 on my devices for a few days and it’s certainly improved things around here. If you can update the DNS servers on your router then that saves you having to update every device one by one. Virgin Media, sadly, do not let me make this central alteration but hey-ho.
DNSPerf gives some statistics on response time, if you’re interested. Give it a go.