The Wi-Fi performance appears limited to 300Mbps.
The Wi-Fi performance appears limited to 300Mbps.
Here are the words from positions 3 to 5 in your initial reply: "halves your bandwidth with no known changes made sounds verging on the difficult side."
They adjusted the setup by relocating the PC for a GPU swap. As soon as you shift the PC or any nearby items, the situation changes completely. It’s possible the antennas dislodged during the process, making it unlikely they were exactly where they were before.
It seems like they probably restored the PC to its original position. A tiny adjustment won't change much. Neither a small distance nor a larger span matters. It might be accurate—definitely worth looking into.
Many situations arise where this happens, particularly when antennas are attached to the back of a PC and the router or AP is positioned ahead, often blocked by the PC case. It's surprising that you're dealing with home networking issues without realizing how much WiFi performance depends on reflections inside the house, including metal walls where even a small inch can change signal strength.
I believe measurements in millimeters don’t matter much, yet your point about metal in the walls is solid. Honestly, I’m out of work and feeling a bit drunk. Nice weather!
It's reasonable to think about it this way. Millimeters might not matter much, but getting the PC back in place usually isn't precise enough—especially for antennas. I've experienced connections that shifted a lot, like moving from one room to another or extending WiFi across a building. Sometimes interference is hard to pinpoint, so you just adapt. That's why wired setups tend to be more reliable.