[Vimaro]

The best is to have an ethernet cable.
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In fact the result of the test is very good for a device of this price (109$ US), and I assume the performance will be better with the x9S than the x8 or equal.
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speedtest 3.2.12
Ping : 4ms
Download : 213mbps
Upload : 116mbps

Thanks Olivier. Yes, it helps.
It would nice to have a similar test with X9S to see if throughput would be significantly better.
But I think X8 would be enough.
In future, I will think to use cables for best results, but if Ultra HD Blu-Ray has a maximum of 128Mbps, only these jellyfish sources require more then 200Mbps.

thanks to all.