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.
Ready
Click Start to begin
Tests your device → SpeedIP server. Other speed tests use different servers.
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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 If slowness returns quickly, look at firmware updates, overheating, or outdated hardware.