Worth checking:

• PC on 2.4 GHz while phone uses 5 GHz; try a 5 GHz SSID.
• Outdated NIC drivers or power-saving modes throttling throughput.
• Ethernet cable damage or 100 Mbps negotiation instead of 1 Gbps.
• VPNs, filters, or security suites intercepting traffic.
• Browser extensions or background sync saturating bandwidth.

Need help? Check here: /services/house-calls/

What it might be (likely causes)

• Band mismatch & Wi‑Fi capability
  Phones often join 5 GHz automatically, while PCs (especially desktops with older adapters) get stuck on 2.4 GHz, which is slower and noisier. Split SSIDs and steer the PC to 5 GHz: /posts/router-settings-small-town/ and apartment RF context: /posts/router-interference-apartments/