A 1 Gbps connection can still feel terrible for gaming or video calls if its latency is high or unstable. Bandwidth is how much data you can move; latency is how quickly it gets there. For real-time activities, the second one matters most. Here is what the terms mean.

Latency and ping

Latency is the delay for data to travel from your device to a server and back, measured in milliseconds (ms). Ping is the tool (and the number) used to measure it. Lower is better. For gaming, aim for ping under about 40 ms; under 20 ms feels great, and over 100 ms causes noticeable lag.

Jitter

Jitter is how much your latency varies from moment to moment. A steady 30 ms is fine; bouncing between 20 ms and 150 ms is not - that inconsistency causes stutter in calls and rubber-banding in games. Keep jitter under ~10 ms for smooth real-time use.

Bufferbloat: the hidden lag

Bufferbloat happens when a device (often your router or modem) buffers too much data during heavy traffic, ballooning latency exactly when you need it low. The classic symptom: your game lags or your call breaks up whenever someone else starts a big download or upload. A connection can post great speed-test numbers and still suffer badly from bufferbloat.

How to reduce bufferbloat

  • Enable Smart Queue Management (SQM) or a bufferbloat/anti-lag setting if your router has one.
  • Use QoS to prioritize real-time traffic over bulk downloads.
  • Set the QoS bandwidth limits slightly below your real speeds so the queue stays under your control, not your ISP's.

How to measure it

A standard speed test reports ping and sometimes jitter. To catch bufferbloat, use a test that measures latency under load (while saturating the connection) - that is where the problem shows up.

Hardware and connection type

Wired Ethernet always has lower, steadier latency than WiFi, which is why serious gamers plug in. The connection type matters too - fiber generally has lower latency than cable or satellite. If you are choosing a router for gaming, see our guide to the best router for gaming, and for traffic-tagging details see what is DSCP.