don't have phone with fast charge. but as I said, worked well with MacBook on C1 and iPad Pro M4 C2. Both where plugged in at different time. first MacBook Pro and then iPad Pro. nothing was slow. for sure then the cable with watt display comes in, then only I will be able to comment clearly on the same.I mean if you are charging a single high power device in a high power port, then when inserting another device(s) in other ports, does the charger switch the charging off for first device then switch to a low power output then start the charging again? or is there continuous charging without cut for the first device?
Better to check this with phones as they give a clear sound cue.
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