Wi-Fi slow or weak

Distance, walls, interference or heavy use can reduce wireless performance.

Do not factory-reset a router speculatively or indiscriminately disable Wi-Fi security or a firewall. Get permission before changing someone else’s network.

Test beside the router and then in the usual location, using the same device for both tests.
Place the router in an open, raised position, not behind a TV, inside a metal cabinet or next to a microwave.
Pause your own large downloads and test again. 2.4 GHz often reaches farther; 5 GHz is often faster nearby. Not every device supports every band.
If only a distant room has poor coverage, consider a compatible mesh node or access point. Put a repeater where the router signal is still good, not in the dead zone.

Test after each step and stop when the issue is solved. Checkmarks are not permanently saved.