Jitter? Plain Explanation
Your video calls freeze for a second, then race to catch up — but your speed test looks fine. That stutter has a name: jitter, the variation in delay between data packets. Steady delay is manageable; wildly varying delay breaks real-time calls and games. This guide explains what jitter is and how to calm it down.
TL;DR / Quick Fix
Quick fix: jitter is the inconsistency of your ping — some packets fast, some slow. A ping test showing wildly different times confirms it. Plug in with Ethernet to rule out Wi-Fi, close bandwidth hogs during calls, and restart your router. Under 30 ms of jitter is fine for calls.
Follow these steps
- Understand what jitter actually is. Ping measures average delay; jitter measures how much that delay jumps around. A steady 80 ms feels fine, but ping swinging between 20 and 200 ms makes calls stutter — read the full explanation for the details.
- Confirm it with a ping test. Run ping for a minute and watch the spread between the fastest and slowest replies. A big spread means jitter; a consistently high number means plain latency instead.
- Plug in with Ethernet. Wi-Fi is the number one jitter source — interference makes packet timing chaotic. One wired test tells you instantly whether the air or the line is at fault.
- Quiet the network during calls. Pause cloud backups, big downloads, and 4K streams while on video calls. Jitter spikes hardest when the connection is saturated — give the call headroom.
- Restart the router and modem. Stale router state causes timing weirdness. Power both off for 30 seconds, power on, and retest — this clears more jitter than any setting tweak.
- Call your ISP with evidence. If wired jitter stays high, run tests at different times, note the pattern, and report it. Jitter on the ISP's side is their problem to fix — your logs make the case.
What NOT to do
- Do not buy a faster plan to fix jitter. Bandwidth does not fix timing inconsistency — a 50 Mbps line with low jitter beats a 500 Mbps line with high jitter for calls.
- Do not test jitter over Wi-Fi and blame the ISP. Test wired first; most jitter is born in your own wireless airspace.
- Do not ignore bufferbloat. If jitter appears only when uploading, your router may need smarter queueing — a real fix, not a faster plan.
- Do not run a VPN during diagnosis. VPNs add their own timing variation; test without it, then re-add it.
Frequently asked questions
What jitter is good for gaming?
Under 30 ms is fine, under 15 is great. What matters most is consistency — steady numbers beat low-but-spiky ones.
Why is jitter worse in the evening?
Neighborhood congestion. Shared cable lines get crowded at peak hours, and packet timing is the first casualty.
Can a new router reduce jitter?
Sometimes — modern routers handle congestion better. But test wired first; if wired jitter is clean, the router's Wi-Fi is the suspect, not the router itself.