Start with a clean baseline
Separate the local link from internet reachability and application performance. Wi-Fi marketing speed, Ethernet port speed, ISP speed and browser throughput are different measurements.
Live evidence
Relevant checks
Screen Resolution TestShow browser viewport, screen dimensions, and device pixel ratio.
→Monitor Refresh Rate TestEstimate display refresh timing using animation frames.
→Display Raw Bandwidth CalculatorEstimate raw uncompressed pixel data rate from resolution and refresh rate.
→Webcam TestOpen your webcam locally to verify that the browser can access and display a live camera stream.
→First sequence
Do the high-signal checks before risky changes
- 1
Simplify to one source, one cable and one display or capture device
- 2
Confirm the target mode works without the switch
- 3
Add devices back one at a time
Decision points
What the result should change
If one client fails, others workPrioritize the client adapter, saved network, cable/port or device policy.
If all clients lose internet but stay associatedPrioritize WAN/modem/DNS/upstream status rather than each device.
If wired is stable and wi-fi is notPrioritize RF placement/interference/channel/client-band behavior.
Browser can help check
- Report the final browser-visible capture or display path
- Calculate raw pixel bandwidth from entered resolution and refresh
Browser cannot prove
- Read HDMI handshake, HDCP or EDID state generically
- Certify a cable or switch for a video mode
- Bypass protected content systems
Repair boundary
Know when to stop browser troubleshooting
- Do not factory-reset a managed or ISP-provisioned router before saving configuration and credentials.
- Do not infer 2.5/10GbE from Wi-Fi class names; verify the exact physical ports.
- Browser Network Information API values are hints and are not a replacement for router/switch counters.
Used-device inspection
What to verify before paying or signing off a repair
- Verify exact WAN and LAN port speeds
- Check Wi-Fi generation/bands supported by your actual clients
- Check mesh/backhaul and VLAN/PoE needs before choosing hardware