I also have 1/1G fiber connection. The car is in the garage, and the WiFi 6 access point (AP) is two walls away in the living room.
I presume you're using the built-in web browser for this. My AP tells me that the car is connected at 390M/260M rx/tx rate. But I can see the MCU's Intel Atom is really struggling, especially with ads loading all over the place during the test.
Here are my results:
View attachment 724985
For comparison, here are my results on my phone, standing in the garage next to my car:
View attachment 724986
And standing with my phone under my AP in living room (best case scenario):
View attachment 724992
I noticed that your ping is pretty high for a fiber connection. Some tips for improvement:
1) Create separate 5Ghz/2.4Ghz networks on AP. Connect Tesla to 5Ghz network.
2) Disable band steering. (e.g. let 5Ghz clients stay on 5Ghz only)
3) Enable 160Mhz channel width on 5Ghz network, and select Highest transmit power. (enables highest bandwidth)
4) Upgrade to a WiFi 6 (ax) AP. (enables WiFi optimizations even if Tesla only supports WiFi 5 (ac))