I just got a Pixel 3 XL two days ago and have some wireless charging pucks in my dash (RPM Teslas Kit) and my phone says "Charging Slowly" when on the puck. When I left work yesterday I was at 73% and 50 minutes later I was at 93%. My home wireless charger is a Samsung unit I bought with my old Galaxy S7 and the phone says "Charging Rapidly" when connected to that. Hope this helps. Great phone BTW and better battery life than my old S7.