What is Jitter?
The hidden enemy of smooth video calls and gaming. Learn why a stable ping is more important than a low one.
What is Jitter? The Hidden Cause of Choppy Internet
Executive Summary
You might have a low ping, but if your internet still feels "stuttery," you likely have a Jitter problem. Jitter is the variance in your latency over time. While latency is the delay, jitter is the inconsistency of that delay. This guide explains why jitter is the secret enemy of VoIP, video calls, and competitive gaming.
Jitter vs. Latency: The Commute Analogy
Imagine your drive to work.
- Latency: It takes exactly 30 minutes every day. You can plan for that.
- Jitter: One day it takes 20 minutes, the next day it takes 45 minutes, and the next it takes 25 minutes. You can't plan for that, and you'll often be late or too early.
Why Jitter Ruins Your Experience
- Video Calls: Jitter causes the "robot voice" or frozen frames because the computer can't reassemble the data packets in the right order fast enough.
- Gaming: Jitter causes "rubber-banding," where your character snaps back to a previous position.
- Streaming: High jitter can cause a video to buffer even if you have plenty of speed.
Comparison: Acceptable Jitter Levels
| Jitter Level | Experience | Status |
|---|---|---|
| < 5ms | Perfect | Ideal for Gaming/VoIP |
| 5ms - 20ms | Good | Unnoticeable for most |
| 20ms - 50ms | Noticeable | Choppy audio, minor lag |
| > 50ms | Poor | Broken calls, unplayable games |
What Causes Jitter?
- Network Congestion: Packets getting stuck in "traffic jams" at different intervals.
- Wi-Fi Interference: Other devices (microwaves, neighbors' Wi-Fi) causing data to be resent.
- Hardware Issues: An old router struggling to process data packets quickly.
- ISP Routing: Poorly managed network paths that fluctuate in quality.
Practical Checklist: Fixing Jitter
- Switch to Ethernet: This is the #1 fix for jitter. Wi-Fi is the biggest source of jitter in most homes.
- Check for Bufferbloat: Use a tool like Waveform to see if your router is causing jitter when the line is busy.
- Update Router Firmware: Ensure your hardware is running the latest optimizations.
- Contact your ISP: If jitter persists on a wired connection, it's likely an issue with the FNO or ISP's network.
Next Steps
Get a connection that stays stable when it matters most.
Related Guides
Frequently Asked Questions
How do I test for jitter?
Most speed test tools (like Speedtest.net) now include a jitter measurement. Look for the 'Jitter' value next to your ping.
Can a VPN fix jitter?
Rarely. In fact, a VPN usually *increases* jitter because it adds another stop for your data. Only use a VPN if your ISP's routing is severely broken.
Is jitter worse on LTE than Fibre?
Yes, significantly. Wireless connections are much more prone to jitter due to environmental factors and tower congestion.
Next Steps
Ready to put this knowledge into practice? Use our tools to find the best fibre connection for your home or office.