You can test the speed of a USB-C cable using a tool called "USB Type-C Testers". These testers measure the voltage, current, and power throughput of the USB-C cable. They also check for any problems with the cable's resistance, which can affect the speed of data transmission.

To use the tester, plug one end of the USB-C cable into the input port of the tester and the other end into the output port. Then, connect the tester to your computer or any other USB-C device. The tester will display the voltage, current, and power readings. You can also use software tools like USBDeview to check the speed of the USB-C cable.

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