Slow internet is one of the most common tech frustrations. The cause could be on your end, your ISP's network, or somewhere in between. Here is how to identify and fix it.
Quick Diagnosis
- Test your speed with our Speed Test. Note the download speed, upload speed, and latency.
- Compare to your ISP plan. If you are getting 80%+ of advertised speed, your ISP is delivering. The bottleneck is local.
- Test wired vs wireless. Connect your laptop to the router with Ethernet and retest. If speed improves dramatically, Wi-Fi is the bottleneck.
- Test at different times. Slow only in evenings? Network congestion at your ISP. Slow all day? Line or equipment issue.
Common Causes and Fixes
| Cause | Fix |
|---|---|
| Wi-Fi signal weak | Move closer to router; upgrade to mesh Wi-Fi |
| Router overloaded | Restart router; check for firmware updates; upgrade old hardware |
| Too many devices streaming | Check which devices are active; pause background downloads |
| ISP peak-hour congestion | Schedule large downloads for off-peak hours; consider switching ISP |
| ISP throttling | Test with VPN - if speed improves, ISP is throttling certain traffic |
| Malware on device | Run malware scan; check Activity Monitor (Mac) or Task Manager (Windows) for suspicious network use |
| VPN overhead | Test speed without VPN; switch to WireGuard protocol for less overhead |
People Also Ask
- Why is my Wi-Fi extremely slow all of a sudden?
- Sudden slowdowns are often caused by a new device consuming bandwidth, a router that needs restarting, ISP maintenance in your area, or malware. Restart your router first, then check for bandwidth-heavy devices.
Related: What affects speed | How to test | Speed Test