What causes jitter?
- Congested Wi-Fi or mobile network conditions
- Interference, weak signal, or unstable router performance
- Background traffic competing for bandwidth
- Unstable ISP routing or overloaded servers
Jitter Guide
What is jitter in an internet speed test?
Jitter measures how much your latency changes from moment to moment. Even if average ping looks acceptable, high jitter can make a connection feel unstable and inconsistent.
Low jitter
A stable connection where latency stays close to the same value over time.
High jitter
Latency keeps jumping around, which can make calls crackle and games feel uneven.
What it affects
Voice calls, video calls, online gaming, live streams, and any service that depends on smooth real-time data.
What counts as good jitter?
| Jitter Range | General Meaning |
|---|---|
| Below 10 ms | Usually excellent for real-time communication and online gaming. |
| 10 to 20 ms | Often still usable, but some instability may be noticeable. |
| Above 20 ms | May cause visible call quality issues, lag spikes, or uneven responsiveness. |
How to improve jitter
- Move closer to the router or reduce interference sources
- Use Ethernet if possible
- Limit heavy streaming, downloads, and uploads during tests
- Repeat tests over time to see whether instability is persistent
Measure jitter with context
LizSpeedTest measures jitter alongside ping, download speed, upload speed, and packet loss so you can tell whether a connection problem is caused by instability instead of raw bandwidth.