Oh you do talk garbage. I've got around fifty clients running through my two Piholes and they work absolutely perfectly. One is using a USB to ethernet adapter and the other is wireless. Nobody knows which one they're using, dns lookups are so small and quick that it's utterly irrelevant.Its utterly rubbish for pihole.
When I ping the wired one, the response is less than a millisecond and the wireless one is around 1.3-1.5ms.