Jitter Test — What is Jitter?
Jitter is the variation in time between data packets arriving at their destination. Even if your ping is low, high jitter means your connection is unstable — causing lag spikes in games, choppy audio in calls, and buffering in streams.
What exactly is jitter?
When data travels across the internet, it's broken into small packets. Ideally, packets arrive at equal intervals. Jitter is how much that timing varies. If packets should arrive every 10 ms but instead arrive at 8 ms, 15 ms, 7 ms, 18 ms — that irregular delivery is jitter.
Jitter is measured in milliseconds (ms). A connection with 2 ms jitter is rock-solid. A connection with 60 ms jitter will give you a noticeably unstable experience even if average ping looks fine.
Jitter values: what's good and what's not
| Jitter | Rating | Best for |
|---|---|---|
| < 5 ms | Excellent | Gaming, video calls, real-time audio |
| 5 – 20 ms | Good | HD streaming, video conferences |
| 20 – 50 ms | Moderate | Web browsing, email, casual use |
| > 50 ms | Poor | Connection problems likely |
How jitter affects your applications
- Video calls (Zoom, Teams, Meet): Jitter above 30 ms causes robotic voice, audio dropouts, and frozen video. The call software buffers incoming audio, but high jitter exhausts that buffer.
- Online gaming: Even 20–30 ms of jitter can cause rubber-banding, teleporting enemies, and "you-hit-but-missed" moments. Competitive shooters require jitter under 10 ms.
- Streaming (Netflix, YouTube): Streaming services use large buffers, so jitter under 50 ms rarely causes obvious issues. But combined with high ping, it can trigger rebuffering.
- VoIP / phone calls: Voice-over-IP is extremely sensitive. ITU-T G.114 recommends keeping jitter below 30 ms for acceptable call quality.
How to measure your jitter
WiFiSpeed measures jitter automatically during every speed test — no extra steps needed. The test sends a series of packets to our nearest server and calculates the variance in arrival times.
For the most accurate reading: close other browser tabs and apps, connect via Ethernet if possible, and run the test 2–3 times and compare results.
How to reduce jitter
- Use a wired connection. Wi-Fi introduces radio interference and channel contention — the single biggest source of jitter for home users. Ethernet typically cuts jitter by 60–80%.
- Reboot your router. Memory leaks and routing table bloat build up over days. A weekly reboot keeps things clean.
- Reduce network congestion. Pause large downloads and uploads while gaming or on calls. Bandwidth-hungry apps eat into the timing consistency of your packets.
- Enable QoS (Quality of Service). Most modern routers can prioritize real-time traffic. Look for QoS or traffic prioritization in your router settings.
- Check for interference. If you must use Wi-Fi, switch to the 5 GHz band and use channels with less overlap from neighboring networks.
- Contact your ISP. Persistent high jitter on a wired connection often indicates problems at the ISP level — line noise, congested backhaul, or faulty equipment.
Frequently asked questions
What is a good jitter value?
Under 5 ms is excellent for gaming and real-time calls. Under 20 ms is good for most applications. Above 50 ms will cause noticeable issues.
What causes high jitter?
Wi-Fi interference, network congestion, overloaded routers, ISP infrastructure issues, and long routing paths all contribute to high jitter.
Is jitter the same as ping?
No. Ping (latency) is the average time for a packet to travel to a server and back. Jitter is the variation in that time. You can have low ping but high jitter — which makes connections feel unstable.
Does jitter affect gaming?
Yes, significantly. Jitter causes lag spikes even when your average ping is low. Competitive games require consistent packet delivery — jitter above 20 ms will hurt your performance.