I bought it for charging my Xiaomi 9S, replacing the old cable.
1) When plugged into a wall socket, it intermittently charges (Original Xiaomi), while with the short cable that comes with the phone, there is no problem.
2) Although it is supposed to be fast charge, it charges slowly both from the wall socket with a 33W charger and from the power bank, which is also fast charge 3.0.
I should note that the original cable fast charges the phone while this one presents the above issues. The strange thing is that in the first few days, it charged normally, but afterwards, it only charges slowly. Sometimes it switches to fast charge on its own. The connection is good and tested, so the problem must be somewhere else, and it is likely due to the cable.