Latency is the time a packet takes to reach its destination and come back, measured in milliseconds; ping is the usual way to measure it. Bandwidth is how much data a connection can carry per second, in Mbps. Low latency makes things feel responsive; high bandwidth makes big transfers fast.
How it works
An analogy
A motorway: bandwidth is the number of lanes, latency is the length of the road. Adding lanes lets more cars travel at once, but each car's journey takes just as long.
What each one affects
- Latency: video calls, gaming, remote desktops, web browsing (a page makes dozens of round trips), SSH typing.
- Bandwidth: downloads, uploads, 4K streaming, backups, many devices at once.
Above roughly 50–100 Mbps per person, extra bandwidth barely changes how web pages feel, but every 10 ms of latency is noticeable.
Where latency comes from
- Distance: light in fibre covers about 200 km per millisecond, so New York to London is ~70 ms round trip at best.
- Each hop: routers and Wi-Fi add delay.
- Queues: a busy link makes packets wait (see bufferbloat).
Ping vs latency
“Ping” is the tool and often the number: the round-trip time it reports is latency, measured with ICMP.
Side by side
| Latency | Bandwidth | |
|---|---|---|
| Measures | Delay | Capacity |
| Unit | Milliseconds (ms) | Megabits per second (Mbps) |
| Better is | Lower | Higher |
| Matters for | Calls, games, browsing | Downloads, streaming |
| Fixed by | Shorter paths, wired links, less queueing | A faster plan, better Wi-Fi |
Examples
- Satellite internet can have 100 Mbps but 600 ms latency (geostationary): downloads are fine, calls are painful.
- A 50 Mbps fibre line with 8 ms latency feels snappier for browsing than 500 Mbps cable with 40 ms.
On a Mac
ping -c 10 1.1.1.1 measures latency; networkQuality measures bandwidth both ways and responsiveness (latency under load), in one go.
See it in the app
LightAtom's Map shows how far your connections travel, the biggest single cause of latency.
Frequently asked questions
Is latency or bandwidth more important?
For calls, games and browsing, latency. For large downloads and streaming, bandwidth. Most home connections have enough bandwidth; latency is often the limit.
Is ping the same as latency?
Ping measures round-trip latency; the number it reports is the latency to that host.
Does more bandwidth reduce latency?
Not directly. It can help if your link is saturated, because queues get shorter.
What is a good latency?
Under 20 ms to nearby servers is excellent, under 50 ms is good, and above 100 ms becomes noticeable in calls and games.