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What is the reason for the sudden drop in download speed? It's probably TCP retransmissions that are being patched up behind the scenes. I captured the packets and counted them.
The download speed suddenly dropped from 28MB/s to 3MB/s, and the web page is still spinning? Don't rush to scold the operator, 80% of the time it's TCP that is frantically retransmitting the patch behind the scenes. I used F12 and three pings to measure the packet loss rate and the number of retransmissions one by one, and then talked about which packet losses can be repaired by myself and which ones need to be reported for repair. ...
