What causes low speed when connecting via a wired Wi-Fi router?

Question

WiFi

Good evening! Faced the following problem:
The computer is connected to the Internet via a Wi-Fi router, by wire. At the same time, the connection speed drops significantly compared to connecting directly. A similar situation is reproduced on two models of routers from different manufacturers (Tp-link, D-link). What could be the problem and how can it be fixed?

Answer 1

The solution to the problem was found, it was necessary to contact the provider (the problem was on his side)

Answer 2

Have you tried another computer/network card?

Answer 3

Generally data model Tp-link Tl-WR841N ; D-link DIR-615/K1 should keep stable 25 Mbps. But still I recommend to put a piece of iron at a higher level and check. This situation often occurs with people who use routers received as a gift from the provider or simply bought in the region of 1000r.