What is packet loss and why does it break games?

Published 10 April 2026 · Last updated 09 April 2026 · Written by UKSpeedTest Editorial Team · Reviewed by Dr Alex J Martin-Smith (LinkedIn) · Sources checked 09 April 2026

Packet loss means some data never arrives and must be resent. Even small loss can cause rubber-banding or hit registration issues. Causes range from bad cables to Wi-Fi interference to wider network problems.

Who this page is for

Players who see loss symbols in game or frequent disconnects.

Plain-English definitions

Packet loss: Percentage of packets that fail to arrive without successful retry within the time the application can tolerate.

Home checks first

Swap Ethernet cables and try another router port.
Remove overloaded powerline adapters temporarily if you use them.
Test without VPN.

Evidence for your ISP

Note dates, times, wired versus Wi-Fi, and any traceroute tools your provider accepts. Pulse helps with latency and jitter trends but is not a full loss diagnostic.

Run the Pulse UK speed test

Pulse measures download, upload, ping and jitter in your browser, and grades how your ping holds up when the line is busy. See our upload guide.

Compare broadband deals when your line is too small for what you do: live deals at your postcode on BroadbandSwitch.uk, lowest monthly price first, from 30+ UK providers.

UK rights and switching: start with Ofcom’s broadband guidance for personalised speed estimates, switching, and complaints.

Example scenario

Loss appears only on Wi-Fi. Wired play is clean. You fix wireless rather than opening a line fault.

FAQ

Does Pulse show packet loss?

Pulse focuses on download, latency, and jitter. Use provider diagnostics or specialist tools for packet loss if needed.

Does Wi-Fi always show packet loss?

Wi-Fi can drop frames under interference. Confirm on Ethernet before assuming an ISP fault.

Should I replace cables before calling my ISP?

Swapping Ethernet cables and ports is a cheap first step that rules out local issues.

Can overheating routers cause loss?

Yes. Ensure ventilation and firmware supported by the manufacturer.

What logs help my ISP?

Date, time, wired versus Wi-Fi, game title, and whether loss appears on multiple devices.

Is mobile tethering more stable than bad Wi-Fi?

Sometimes for testing, but allowances and latency differ. Compare fairly for your tariff.

Related guides

References

Published by: BroadbandSwitch.uk · Reviewed by: Dr Alex J Martin-Smith (LinkedIn) · Note: general information about broadband, not advice on your own contract. Check your provider's documents and Ofcom's guidance for your case.