Does a Magnetic Charging Cable Charge Slower?

A magnetic charging cable should not be treated as a charging-speed upgrade by itself. Charging speed depends on the connector pairing, charger, and device. On this cable, USB-C to USB-C reaches its highest rated wattage, while USB-A pairings cap lower. The magnetic design mainly improves storage convenience.

The short answer above is the one to remember. The longer version helps if you're choosing which connector pairing to actually use:

Speed comes from the pairing, not the magnet

On this cable the rated maximums vary sharply by which ends you use: USB-C to USB-C is rated up to 240W max, USB-A to USB-C up to 100W max, and both Lightning variants up to 27W max. If you want maximum fast-charging, choose the USB-C to USB-C pairing deliberately — the other pairings charge at the rated limit of that connector pairing. {{SKU:ATM-CBL-002}}

So what is the magnet for?

Storage. When you unplug, the magnetic body coils onto itself, so a cable that's on the desk all day stores compactly the moment you're done. That's the feature you're buying — a tidy reset on a shared desk — not a charging boost.