Under the same wireless router, wired should theoretically be more stable than wireless. As for whether the wired must be fast, it depends on the distance used by the wireless, as well as the number of concurrent wireless. If the wireless distance route is very close, it is basically no different from the wired route, and it may be faster.
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There is also the problem of routing itself, such as the aging of some modules in the wired part, and the network cable cannot reach the five categories.