Latency is the delay between when you send data and when it arrives

Latency is the time it takes for information to travel from your device to another computer and back. When you click a link, type in a chat, or load a webpage, that action has to travel across the internet to a server somewhere, get processed, and come back to you. Latency is the invisible wait built into that round trip — measured in milliseconds (ms).

You experience latency every time you use the internet, but you only notice it when it gets high. A delay of 20 ms feels when ready. A delay of 500 ms feels like the internet is broken. The difference between a smooth video call and a choppy one, between a responsive game and a laggy one, often comes down to latency rather than how fast your internet connection is.

Key Takeaways

  • Latency is measured in milliseconds and represents the round-trip time for data to leave your device and return, not how much data you can read per second.
  • Most everyday tasks feel responsive at latencies below 100 ms, but video calls, online gaming, and real-time applications start to feel sluggish above 150 ms.
  • Your distance from the server, the number of devices on your network, and the type of internet connection you have all affect latency.
  • You can measure your latency using a ping test, which shows you the actual milliseconds of delay on your connection right now.

How latency differs from internet speed

Internet speed and latency are two separate things that people often confuse. Speed tells you how much data can move per second — measured in megabits per second (Mbps). Latency tells you how long the journey takes. You can have fast internet with high latency, or slow internet with low latency, and each creates different problems.

Think of it like a highway. Speed is how many cars can pass a point per minute. Latency is how long it takes one car to drive from one exit to another. A highway with 10 lanes (high speed) but a 200-mile distance (high latency) moves a lot of traffic but each trip takes forever. A two-lane road (low speed) but only 5 miles long (low latency) moves fewer cars but gets each one there quickly.

For downloading files or streaming video, you need speed. For video calls, online games, and anything where you need an when ready response, you need low latency. Most home networks have enough speed but struggle with latency because of distance, network congestion, or the type of connection.

What causes latency on your home network

Latency starts the moment your device sends data. The data has to travel through your router, out to your internet service provider's equipment, across the internet to the destination server, and back the same way. Each hop adds a tiny delay. The farther the server is from you, the longer the journey, the higher the latency.

On your home network itself, latency can spike when too many devices are connected and competing for bandwidth. If five people are streaming video while you are trying to join a video call, the router has to juggle all that traffic, and your data gets queued. A weak WiFi signal also increases latency because the router has to resend packets that did not arrive cleanly the first time.

Your internet connection type matters too. Fiber and cable connections typically have lower latency than satellite or fixed wireless, because the physical path the data takes is shorter or more direct. Satellite internet, for example, has to send data 22,000 miles up to a satellite and back down, which adds 500+ ms of latency before anything else happens.

Latency ranges and what they mean for different activities

Below 50 ms is excellent and covers almost everything you would want to do. Video calls, online gaming, web browsing, and real-time applications all feel responsive and smooth. Most people with cable or fiber internet in urban areas sit in this range.

50 to 100 ms is good for most tasks. Video calls and web browsing feel normal. Online gaming is playable but you might notice a slight delay in fast-paced games. This is the target range for a well-functioning home network.

100 to 150 ms is noticeable. Video calls start to feel slightly awkward because there is a perceptible pause between when you speak and when the other person hears you. Competitive online games become frustrating. Web pages load fine, but interactive elements feel sluggish.

Above 150 ms is problematic for real-time activities. Video calls become difficult. Online games are unplayable for competitive play. If you are consistently above 200 ms, the issue is usually your connection type or your distance from the server, not your home network.

How to measure your latency with a ping test

A ping test sends a small packet of data to a server and measures how long it takes to come back. The result is your latency in milliseconds. You can run a ping test from your computer or use an online tool.

On Windows, open Command Prompt and type ping 8.8.8.8 (Google's public DNS server). On Mac or Linux, open Terminal and type the same command. The results show four ping times — look at the average. That number is your latency to that server.

Online ping test tools like Speedtest.net or Fast.com also measure latency as part of their results. These are easier if you are not comfortable with the command line. Run the test a few times at different times of day — latency can vary depending on network congestion.

If your latency is high, ping a server that is geographically closer to you, then one that is farther away. If the close one is low and the far one is high, distance is the issue and there is not much you can do. If both are high, the problem is your connection or your home network setup.

Ways to lower latency on your home network

Use a wired connection instead of WiFi when you can. Ethernet cables eliminate the wireless overhead and interference that adds latency. If you are gaming or on an important video call, plug in directly to your router.

Move your router to a central location and away from obstacles. Walls, metal, and other electronics interfere with WiFi signals and force the router to resend packets, which increases latency. A router in the middle of your home on a high shelf works better than one hidden in a corner.

Reduce the number of devices using your network at the same time. If someone is downloading a large file or streaming 4K video, it consumes bandwidth and can queue your traffic. Ask them to pause, or upgrade to a faster connection if this happens regularly.

Restart your router regularly. Routers can accumulate temporary issues that slow down performance. Unplugging it for 30 seconds and plugging it back in clears the memory and often improves latency.

If latency is consistently high and you have tried these steps, the issue is likely your internet service provider or your connection type. Fiber and cable have lower latency than satellite or fixed wireless. If you have options, switching providers or connection types is the real solution.

Frequently Asked Questions

Is 100 ms latency good?

100 ms is acceptable for most activities but noticeable for real-time tasks. Web browsing and video streaming feel fine. Video calls have a slight delay, and competitive online games become frustrating. For gaming or calls, aim for below 50 ms.

Why is my latency high even though my internet speed is fast?

Speed and latency are separate. You can have 500 Mbps read speed but 200 ms latency if the server is far away or your connection type is satellite. Latency depends on distance and the path your data takes, not how much data can move per second.

Does WiFi always have higher latency than ethernet?

WiFi adds latency compared to a wired connection, but the difference is usually small — 5 to 20 ms — unless your signal is weak or interference is heavy. A strong WiFi connection is fine for most tasks. Weak WiFi can add 50+ ms because packets have to be resent.

Can I lower latency by changing my DNS server?

Changing DNS can help slightly if your current DNS is slow, but it usually makes a small difference — a few milliseconds at most. Your latency to the actual server matters much more than DNS. Try Google DNS (8.8.8.8) or Cloudflare DNS (1.1.1.1) if you want to test it.

What latency should I expect with satellite internet?

Satellite internet has 500+ ms of latency built in because data travels 22,000 miles to the satellite and back before it even reaches the internet backbone. This makes video calls difficult and online gaming nearly impossible. It is fine for downloading and browsing but not for real-time activities.