Why Is My Internet Slow?
Common causes of slow internet—Wi-Fi, ISP throttling, congestion, old hardware—and how to diagnose with a speed test.
Slow internet rarely has a single cause. Start by comparing your speed test to your ISP plan—if results are far below what you pay for, the issue may be Wi-Fi, congestion, or your provider.
Check whether slowness affects one device or everything. One slow phone points to Wi-Fi; all devices slow on ethernet points to ISP or modem problems.
Run the test below on the affected device. Repeat on ethernet if possible to isolate wireless issues.
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Download measured to Google, Cloudflare, Netflix, Amazon, and other major CDNs — the networks that actually deliver the web.
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Frequently Asked Questions
Can my ISP throttle me?▾
Some ISPs throttle specific traffic or enforce caps. Consistent low speeds on ethernet across multiple tests support calling your provider.
Does restarting the router help?▾
Often yes for temporary glitches. If slowness returns quickly, look at firmware updates, overheating, or outdated hardware.