visualizer stream versus Artnet

Hog4Pc, nanowing with 1 super widget
Hognet on loopback adaptor (172.31.0.1)
Fixturenet on network card (192.168.2.10)

Hi,
I have a show of 35 universes that I connect to lightconverse with the visualizer stream.
The hogpc detects automatically the visualizer (192.168.2.9) and lightconverse receives all the channels.
The problem is that lightconverse receives only 3fps ....
When I take a few outputs and put them on Artnet, lightconverse receives 25fps well on those universes ....
I tried to remove all fixtures except 2 universes and I have 3fps again with visualizer stream...
Where is the problem?

Regards