Switch limits my upload speed

[Vassy]

Hello. I have a managed switch. D-LINK DGS-1100-08.

My internet speeds, download / upload are 100 Mbps.

Using speedtest.net, I get the correct download / upload speeds, but using testmy.net, the download speed is correct, but the upload speed it's about 3.5 - 4 Mbps.

Also, the real world speeds are the same as the tests from testmy.net.

What could be the problem?

Of course, connecting directly to the router, the speeds are correct, only through the switch I have the problems.

 

Thank you in advice. 

[Electronics Wizardy]

Since speed test shows speeds re being right, the switch seems to be ble to pss the raffic correclty.

 

What reouter do you have? Have you reset the settings and reboot it?