Nine fixes for slow Wi-Fi that actually work

Start by testing over Ethernet. If the wired result matches your plan, the bottleneck is Wi-Fi, not your provider.

Move the router up and out: central, elevated, away from metal, mirrors and microwaves. Antenna height beats antenna count.

Split or steer bands sensibly. 5 GHz for anything nearby that needs throughput; 2.4 GHz only for distance and small IoT devices.

Then check channel congestion, update firmware, and disable legacy 802.11b rates if your router exposes them.