Does Mikrotik Hex output 1 gigbps?

Question

Mikrotik

Prov gives his router (gpon) and a channel of 1 gigabits / s.
If you connect a computer to their router, then the speedtest (Yandex) gives out 850-950 megabits / s.
If you turn on Mikrotik Hex as a router to the Provo router (without firewall rules and static routes, only nat in the form of masquerade) and connect a computer to it, then the speedtest shows 450-500 megabits. In short, the microt settings are almost empty).
In general, the only changing element in the scheme is the presence or absence of Mikrotik in it. Everything else, including the cable, is the same.
At the same time, in tests (albeit synthetic, but the speed test for Yandex, I think, the same synthetics) on the offsite, Mikrotiks appear at 2 gigabits / s, even with firewall rules.
Microta year 3 (maybe the capacitors have dried up and are no longer a gigabit cake, I don’t know).
How to identify the problem?

PS Now I have transferred the "wan" port to the bridge (I made a stupid switch out of Mikrotik). The speed has risen to 940. That is, it turns out that in router mode it does not show those declared by the manufacturer). Although the percentage at the time of the test shows a load of 30 percent.

Answer 1

You here
https://forum.mikrotik.com/
or at least here
https://forummikrotik.ru/
the case when specialized forums are closer / faster to the goal

Answer 2

Turn on fast track. Feel better.

Answer 3

Oddly enough, this method once helped:
Turned on tx and rx flow control in on

Answer 4

1. Go to the Microt website and look for a router there
2. Open the Test Results
tab 3...
4. We see that in the router mode with fast path enabled, the box can only 529.9 Mbit / s
Optional:
- buy another router