Packet Loss: How to Measure It and Fix It for Smooth Video Calls

Q: How much loss is acceptable?

Under 0.5% excellent. 0.5-1% noticeable. Over 2% calls degrade significantly.

Q: Why does loss appear only during calls?

Bandwidth saturation. Cloud backup or OS update is using upstream.

Q: Does QoS in the router help?

Yes. Enable QoS and put Zoom on top priority.

Q: Does powerline adapter cause loss?

Sometimes. Old wiring adds jitter. New Wi-Fi mesh is often more reliable.

Q: Will a new router fix everything?

Often, especially if your current is ISP-supplied and 5+ years old.

Updated: June 2026

Quick answer: Packet loss is when some of the data your computer sends or receives never arrives. Above 1 % loss the symptoms become visible — frozen video, robotic voice, dropped calls. Fix priorities: (1) move to Ethernet from Wi-Fi, (2) update router firmware, (3) restart the modem, (4) call the ISP if loss happens to anywhere outside your network.

TL;DR — Fix packet loss in 5 steps

Test on Ethernet. If loss drops to zero on cable, your Wi-Fi is the cause.
Restart router and modem. 30-second power cycle fixes most ISP-side hiccups.
Update router firmware. Recent ASUS, TP-Link, Netgear releases addressed common loss bugs.
Switch DNS to 1.1.1.1 or 8.8.8.8 — sometimes ISP DNS adds intermittent loss.
Call the ISP if traceroute shows loss at their hops.

What packet loss really means

Every internet message — a Zoom video frame, a Spotify song chunk, a webpage byte — is split into small packets sent independently. Some never arrive due to congestion, faulty hardware, electromagnetic interference, or buffer overflow. TCP retransmits them (slow); UDP-based apps like Zoom and games don't, so the loss is audible/visible.

Detailed Guide

1. Measure packet loss

Use our internet test — it reports loss alongside speed and jitter. Run from Ethernet first to isolate the LAN. For deeper diagnosis use ping 8.8.8.8 -t on Windows or ping 8.8.8.8 on macOS/Linux, run for 60 seconds, watch for "Request timed out" lines.

2. Wi-Fi vs Ethernet

Wi-Fi is the #1 cause of household packet loss. Reasons: interference from microwaves, baby monitors and neighbours' routers; weak signal from distance or walls; 2.4 GHz channel congestion. Switch to 5 GHz or 6 GHz (Wi-Fi 6/7), bring the laptop closer, or use Ethernet.

3. Restart the router and modem

The classic fix because it works. ISP-side connection states get stuck after weeks of uptime. Power off modem and router, wait 30 seconds, power modem first, wait for sync, then router. Loss often disappears.

4. Firmware updates

Router makers release firmware quarterly. Recent fixes for ASUS RT-AX86U, TP-Link Archer AX73 and Netgear Nighthawk specifically addressed packet loss under heavy QoS. Update via the router's admin page or vendor app.

5. Local interference

Don't place the router near a fridge, microwave or baby monitor.
Avoid stacking the modem and router; heat causes errors.
Use a quality Cat6 Ethernet cable, not a 10-year-old Cat5.
Replace coaxial cable splitters on cable internet — old splitters add loss.

6. ISP-side loss

If loss persists even on Ethernet to your ISP, the problem is your provider. Use a traceroute (Windows: tracert 8.8.8.8; mac/Linux: traceroute 8.8.8.8) to see which hop drops packets. Take a screenshot and call your ISP.

7. VPN and proxy issues

VPNs add their own packet loss when their endpoint is congested. Disable VPN temporarily and retest.

8. Server-side loss

Sometimes the problem is on the far server. If your ping to 8.8.8.8 is clean but to your video-call server is lossy, that server's data centre is the culprit. Wait or switch region in the call app.

FAQ

How much loss is acceptable?
Under 0.5 % for excellent calls; 0.5–1 % noticeable but tolerable; over 2 % calls degrade significantly.

Why does loss appear only during calls?
Bandwidth saturation. Another app (cloud backup, OS update) is using upstream and squeezing your call.

Does QoS in the router help?
Yes — it prioritises real-time traffic. Enable QoS or "Game Mode" in the router and put Zoom on top priority.

Does powerline adapter cause loss?
Sometimes yes — old wiring or mixed circuits add jitter and loss. Newer Wi-Fi mesh systems are often more reliable.

Will a new router fix everything?
Often, especially if your current router is ISP-supplied and 5+ years old. New ASUS, TP-Link, Eero models handle modern density better.

Key Takeaways

Test on Ethernet first — it isolates Wi-Fi from ISP causes.
Restart modem and router fixes most short-term packet loss.
Firmware updates matter; check quarterly.
Persistent loss outside your network means it's the ISP's job to fix.