I use wireless virtual desktop. I've tried using the cable through an ethernet adapter straight into the router, and also into the PC through pico streaming assistant but saw zero difference to the quality or latency.
The 4090 can run god mode at 150mb bitrate at between 30-40ms of latency which is the best you're gonna get. Usually moving the bitrate down reduces latency if you are struggling, but the 4090 is such a beast you don't need to.
Using the cabled quest link on my quest2 saw slightly higher latency than pico4 over wireless virtual desktop, plus VD looks way better due to the h265 codec.
I see no signs of compression. Literally none, and if there was any I'd see in situations like this.....
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