I bought Mikrotik CRS112-8G-4S-IN router 2 days ago I have 1gbps internet, when I connect to pppoe client, my internet speed is 23 mbps. When I turn on fast track, it gets 200 mbps, I couldn’t understand the reason for the problem.
The reason is that CRS112 is antiquated switch (which happens to support routing functions but at low sppeeds). It’s not listed under “archived” hardware on MT page, but it’s antiquated nrver the less. Just to be clear: it’s still strong if used as proper 1Gbps switch, but for routing it was never a performer.
Is it the same if I connect from the sfp port?
CRS112 is not a router. You bought the wrong device.
Yes, all ports are connected to switch chip, that one in turn is connected to CPU (doesn’t matter that both main parts are in same SoC).
But your main problem is not device topology, the problem is low-performance CPU.