Unbound is a recursive & caching DNS server. You can use it to query DNS "directly", avoiding your ISP's DNS server. At some point in time I'd have said this

Unbound is a recursive & caching DNS server. You can use it to query DNS "directly", avoiding your ISP's DNS server. At some point in time I'd have said this would increase your DNS latency, but given the poor level of service that many ISP servers provide, I don't think that's true anymore. Though I have no data to back this up, I suspect many home users visit a fairly small set of websites and so DNS caching would work very well.