We're talking about the same exact card, right? In that 3 seconds, the charge slip is already being printed out, whereas it takes 8 for the dipped chip?

I suspect the app on the terminal reading the EMV takes its sweet time to talk to the card since it knows the card is just there. Whereas with contactless, the an imperative to optimize the communication. TL;DR bad programming of the app.

Both should work more or less within the same time window. Or at least not take 5 frigging seconds longer.