I also think I've managed to make a welcoming, simple and safe surface API at the same time, so the postgres experience in Node becomes even nicer. Feedback is very much welcomed.
I found a lot of inspiration for tricks to make it faster in other libraries, but the biggest boost came from following the Postgres protocol docs recommendations.
Another thing I've found since becoming a Postgres user is how amazing their documentation is once you wrap your head around it. It took me a while, probably because I've always been used to quickly scanning documentation for the thing I need, instead of actually reading it. That's a foolish thing to do with the Postgres docs. There is so much useful information in there, so now I just read from top to bottom every time I look at a topic.