About the speed limit of Harbin Telecom’s optical fiber

Haha, I can only say that you are an exception. The telecommunications optical fiber I use on Daowai Nan'an Street has the same tariff as yours.

But when I download Thunder movies, good resources can reach nearly 2M, and the average ones are more than 400kb.

My fiber optic box is also full, but the speed is still the same. It may be a problem with your wiring.