Start with a clean baseline

  1. Pause streaming, backups, updates and file transfers.
  2. Turn off a VPN or proxy for the baseline test.
  3. Keep this tab visible and close unusually heavy applications.
  4. Run three tests and compare the median—not only the best result.

Compare Wi-Fi with Ethernet

If Ethernet is fast but Wi-Fi is slow, the internet line is probably not the main bottleneck. Move closer to the router, place it in the open, try the 5 GHz or 6 GHz band at short range, and reduce competing networks or repeaters. If both are slow, continue with the router and provider checks.

Read the pattern, not just download speed

Slow all day

Check plan limits, cables, router capability and device limits.

Slow at busy hours

Local or provider congestion is more likely.

Fast speed, bad calls

Look at jitter, request loss and upload saturation.

One device only

Update that device and check its radio, software and background use.

Restart carefully

Reboot the modem or optical terminal and router once, allowing them to reconnect fully. Repeated restarts can erase the evidence of an intermittent fault. Check that Ethernet cables are seated and rated for the expected speed, and that the router’s ports support the plan.

When to contact the provider

Contact the ISP when several wired tests remain far below the plan, request loss persists, or the connection repeatedly disconnects. Send times, wired results, equipment status and a description of the impact. A consistent record is more useful than one isolated test.

Further reading