What is the reason that the ice making mechanism is too slow?

What is the reason that the ice making mechanism is too slow? My friend's ice maker is faster than my ice maker in the same store! Who can help solve the problem?

Look at the power, too, the refrigerant is inadequate.

Lack of refrigerant;The waterway was slightly blocked.I hope I can help you!!

The slow cause of ice making mechanismMost are poor heat radiation;The compressor is inefficient;