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Troubleshooting

Why Is My Download Speed Slow But Upload Is Fine?

Different download and upload speeds are normal — but a big gap beyond your plan's spec usually points to a specific problem. Here's how to diagnose it.

Updated 2026

  1. 1

    Understand that asymmetric speeds are normal

    Most home broadband plans are asymmetric by design — e.g. 100Mbps download, 20Mbps upload. Check your plan's specs before assuming something is wrong.

  2. 2

    Run a wired speed test first

    Plug directly into the router with Ethernet. If download is still low on a wired connection, the issue is the line or ISP — not your WiFi.

  3. 3

    Check for download-specific throttling

    Some ISPs throttle specific services (streaming, torrents) during peak hours while leaving upload unaffected. A VPN test can reveal this.

  4. 4

    Check your router's download queue

    If something is downloading in the background (OS updates, game patches), it saturates download bandwidth while leaving upload free. Check all devices.

  5. 5

    Check for a bad cable or filter

    On DSL connections, a damaged phone cable or unfiltered extension can degrade download more than upload due to how DSL works. Test at the master socket.

Frequently Asked Questions

Can my router cause slow download but normal upload?
Rarely — router hardware affects both equally. More likely causes are WiFi interference, ISP throttling or a background download.
Is slow download always the ISP's fault?
No. It's more often WiFi distance, a congested channel, or a device using the connection. Eliminate local causes first with a wired speed test.