Why Is My Jitter So High? Causes and How to Fix It
Jitter is variation in packet arrival timing — the enemy of smooth video calls and lag-free gaming. A connection with 20ms average ping but 15ms jitter delivers packets arriving anywhere from 5ms to 35ms, causing inconsistent behavior. Measure your jitter alongside ping at instantspeedtest.net/.
High Jitter Causes — By Connection Type
| Cause | Connection Type | Fix |
|---|---|---|
| WiFi signal fluctuation | Any WiFi | Switch to Ethernet or improve signal |
| WiFi interference (microwave, Bluetooth, neighbors) | 2.4 GHz WiFi | Switch to 5 GHz; change channel |
| ISP peak-hour congestion | Cable, DSL | Document; test at different times; switch ISP |
| Bufferbloat at router/modem | All types | Enable SQM/QoS on router |
| Poor physical line quality | DSL, cable | Contact ISP for line repair |
| Satellite orbit timing variance | Satellite internet | Inherent to satellite; limited options |
How Jitter Affects Different Activities
Jitter under 5ms: excellent for all activities. 5–15ms: acceptable for gaming, minor video call quality impact. 15–30ms: noticeable in competitive gaming; video calls may have occasional audio glitches. Over 30ms: gaming lag spikes, video call freezes and audio drops, VoIP issues. The impact is more severe for real-time applications than for streaming — Netflix buffers ahead to absorb jitter, but Zoom and online games cannot. See our detailed guide on what jitter is.
Related Guides
- What Is Jitter?
- Jitter vs Ping for Gaming
- High Ping on Wired Connection
- How to Reduce Ping in Gaming
- Wired vs Wireless Internet Speed
- What Causes Packet Loss?
Frequently Asked Questions
Is 20ms jitter bad?
For gaming, 20ms jitter is problematic in competitive play — it means your ping fluctuates by ±20ms around its average, causing inconsistent registration of actions. For video calls, 20ms jitter is noticeable but usually manageable. For streaming, it’s irrelevant. The fix priority depends on your use case. Switching from WiFi to Ethernet typically drops jitter from 15–30ms to under 2ms in one step.
Why does my jitter spike at certain times?
Time-correlated jitter spikes point to peak-hour ISP congestion, scheduled background tasks (automatic backups, Windows updates), or interference patterns. If spikes occur at exactly the same time daily (e.g., 8pm), ISP congestion is the likely cause. If spikes are random but frequent, check Task Scheduler and background app activity for periodic processes consuming bandwidth irregularly.