Slow internet speed - RPI 3B

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@mrmiegas

sorry for asking but maybe I could get somewhere more details on what exactly I need to do?

I guess you found this in the meantime

[How To] Check Network Performance with iperf3

Sometimes it is important to check the network performance between your OSMC Device and the device providing your media (NAS, Server, PC). Especially when you are connected via wireless the throughput variations can harm you viewing experience. This short How To should give you the required information how to install iperf3 and how to run the respective tests. When doing these tests it is suggested to have a simple setup (single switch between Sender and Receiver and avoid other traffic on the …

@mrmiegas

The problem is that my PC (ultrabook) doesn’t have LAN connection

You mean no Ethernet? But I guess it has WiFi so you at least can test WiFi to WiFi performance in your LAN