Featured image of post Why 1000M fiber broadband, sometimes the speed is only 300M

Why 1000M fiber broadband, sometimes the speed is only 300M

I wrote this question mainly because I searched all kinds of information on Baidu, and it was basically the same content. There were few articles that clarified this question. Most of them were nonsense. Sarcasm and personal attacks have no idea of solving the problem. Since I just encountered this problem, I will write a solution here.