Why does my Wi-Fi crawl every evening, and what’s the one fix that actually works?

Evening slowdowns usually come from one of two bottlenecks: your internet provider’s shared connection is busy, or nearby home networks are crowding the same radio channel. Test once beside the router and once over Ethernet during a slow period; if Ethernet stays fast, rebooting the router so automatic channel selection can rescan—or manually choosing a quieter channel—targets the Wi-Fi problem. If Ethernet also slows, save the timed speed tests and take them to your provider.