Start with measurable causes
Do not infer the source from one speed number. Compare the same device, destination and time under controlled conditions.
CONNECTION DIAGNOSIS
Why Is My Internet Slow at Night?
Evening slowdowns often point to congestion on the home network or the provider network. Repeat comparable wired tests during quiet and busy hours to distinguish a recurring pattern from one bad result.
Compare, don’t guess
Run tests at the same times for several days. Keep other variables stable, then change one condition at a time.
What can create this pattern
More household devices stream or download at once
Confirm this possibility with a repeatable comparison before changing equipment or service.
Neighborhood or ISP capacity is congested
Confirm this possibility with a repeatable comparison before changing equipment or service.
Wi-Fi contention increases when neighbors are active
Confirm this possibility with a repeatable comparison before changing equipment or service.
A scheduled backup or update runs in the evening
Confirm this possibility with a repeatable comparison before changing equipment or service.
Test it in this order
Run tests at the same times for several days
Record the result, keep the test comparable and continue only after this step.
Test with Ethernet and one active device
Record the result, keep the test comparable and continue only after this step.
Check latency while another device downloads
Record the result, keep the test comparable and continue only after this step.
Save results before contacting the ISP
Record the result, keep the test comparable and continue only after this step.
Use more than download speed
Read throughput together with ping, jitter and packet loss. A browser result describes this device, route and moment; it does not by itself prove an ISP fault.
Continue the diagnosis
speedtest latency network qualityFrequently asked questions
Why Is My Internet Slow at Night?
Evening slowdowns often point to congestion on the home network or the provider network. Repeat comparable wired tests during quiet and busy hours to distinguish a recurring pattern from one bad result.
What should I test first?
Run tests at the same times for several days. A repeatable fall in throughput or rise in latency at busy hours is stronger evidence than one test.
Does one test prove the cause?
No. Repeat comparable tests over Ethernet and Wi-Fi, on more than one device and at different times.
MEASURE BEFORE YOU CHANGE
Start connection test →Find where the connection slows down
Save the result, repeat under comparable conditions and use the difference as evidence.