1. It's either a regular USB-C cable or a Thunderbolt (USB4) cable. If it's a Thunderbolt cable, it'll have a large, long, square strain-relief section behind the connector (there are active logic components inside this part.) Otherwise it won't.
2. The charging speed is fundamentally constrained by how thick the cable is. So thick cables are very likely fast-charge cables (they wouldn't spend the extra money on lower-gauge copper if they weren't going to need it for something), and thin cables definitely aren't.
2. The charging speed is fundamentally constrained by how thick the cable is. So thick cables are very likely fast-charge cables (they wouldn't spend the extra money on lower-gauge copper if they weren't going to need it for something), and thin cables definitely aren't.