A WiFi speed test measures what actually reaches your device over the air — which is usually lower than your plan because of distance, walls and interference.

The two-test method

Run the test standing next to the router, then again in the room where it feels slow. A big drop between the two means the problem is WiFi coverage, not your ISP.

What to change first

Lift the router off the floor and out of cabinets, switch to the 5 GHz band for nearby devices, and keep it away from microwaves and cordless phones. Re-test after each change.