01 · Ethernet cable
Establish a wired baseline
Useful when: Wi-Fi changes with room, distance or interference, while the device has a working Ethernet port.
Check first: port speed, cable length, route through the room and whether a borrowed cable changes the symptom.
Will not fix: game-server load, ISP routing, or congestion upstream of your router.
02 · USB Ethernet
Add a wired port carefully
Useful when: a laptop or handheld lacks Ethernet but supports a stable, compatible USB adapter.
Check first: connector type, USB generation, operating-system drivers, device power limits and supported link speed.
Will not fix: a damaged router port, poor upstream routing or an overloaded game service.
03 · MoCA
Reuse suitable coax wiring
Useful when: Ethernet cannot be run, Wi-Fi is unstable and compatible coax already links the required rooms.
Check first: coax continuity, splitters, filters, modem topology, free wall outlets and whether your provider uses the same coax path.
Will not fix: bad ISP peering, server-side desync or frame-time stutter.
04 · SQM router
Control local queueing
Useful when: latency rises specifically while someone uploads or downloads and a controlled idle-versus-busy comparison repeats that pattern.
Check first: current router settings, connection speed, firmware support, CPU capacity and whether SQM can shape the actual WAN bottleneck.
Will not fix: route distance, a distant game region or congestion outside your home network.