To all 15U users, what is your charging speed?

I recently bought the 15 Ultra and it seems really slow at charging inspite of turning on selecting Top speed from setting, using the 90W charger and the cable that came along in the box.

0 to 80% took 60 mins 0-100 took around 1hr 15 mins

This is bit disappointing since I was expecting a faster charging speed. I have done the testing with the phone off.