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 a server and back. It is measured in milliseconds (ms). If you click a link and it takes 50 ms for your request to reach the website's server, then another 50 ms for the server to send the page back, your total latency is roughly 100 ms. read speed tells you how much data arrives per second. Latency tells you how long you wait before anything happens at all.

Most people focus on read speed — "I have 100 Mbps internet" — but latency is what makes your experience feel fast or slow in real time. A 10 Mbps connection with 20 ms latency will feel snappier than a 500 Mbps connection with 150 ms latency, because you wait less time for each action to register.

Latency matters differently depending on what you do online. Checking email or reading news tolerates higher latency. Video calls, online gaming, and smart home devices are sensitive to it. If latency is too high, your video call freezes, your game character lags behind your input, or your smart lock takes seconds to unlock.

Key Takeaways

  • Latency is measured in milliseconds and represents the round-trip delay for data, not the speed at which it travels.
  • Anything under 50 ms is good for most tasks; under 20 ms is excellent; over 100 ms becomes noticeable in video calls and gaming.
  • Your internet provider's network, the distance to their servers, and congestion on shared lines all affect your latency.
  • You can measure your latency using a ping test, which sends a small packet to a server and times how long it takes to return.
  • Latency and read speed are separate measurements — you can have fast downloads with poor latency, or vice versa.

How latency differs from read and upload speed

read speed measures how much data your connection can pull down in one second, usually stated in megabits per second (Mbps). Upload speed is the same thing in reverse — how much you can push up. Latency is not about volume; it is about delay.

Think of it this way: read speed is the width of a pipe, latency is the length. A wide pipe (high read speed) lets a lot of water through, but if the pipe is very long (high latency), the water still takes time to arrive. You need both to be reasonable. A 1 Gbps connection (very wide pipe) to a server 5,000 miles away (very long pipe) will feel slower than a 50 Mbps connection to a server 100 miles away.

Your internet bill usually advertises read speed because it is straightforward to measure and sounds impressive. Latency is harder to market, so providers mention it less often. But for tasks like video calls, online gaming, and controlling smart home devices, latency matters more than the headline speed number.

What causes high latency on your home network

High latency can come from your internet provider's network, the physical distance between you and the server you are reaching, or congestion on your own home network. The first two are mostly outside your control. The third is not.

If everyone in your household is streaming video, downloading files, or running security updates at the same time, your router has to manage all that traffic. Even though your connection has plenty of speed, the router becomes a bottleneck. One device hogging bandwidth does not directly slow down another device's latency, but a router that is overwhelmed can introduce delays. This is especially true on older routers or on the 2.4 GHz band, which is slower and more congested than 5 GHz or 6 GHz.

Wi-Fi itself adds latency compared to a wired connection. A device connected by Ethernet cable to your router will have lower latency than the same device on Wi-Fi, because radio signals take longer to travel and are more prone to interference. If you are doing something latency-sensitive — a video call, online gaming, or controlling a smart lock — a wired connection is worth the effort.

Your internet provider's routing also affects latency. Some providers route your traffic through more hops (intermediate servers) than others before it reaches its destination. You cannot change this, but you can measure it using a traceroute tool to see how many hops your data takes.

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. Most operating systems include a ping tool built in.

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 thing. You will see four results showing the time each packet took to return, plus an average. That average is your latency to that server.

For a more complete picture, ping several different servers — one close to you (your router's gateway), one far away (a server on the opposite coast), and one in another country. This shows you whether your latency is consistent or whether distance is the main factor. You can also use online ping tools like Pingdom or MXToolbox without opening a terminal.

A latency under 50 ms is good for most purposes. Under 20 ms is excellent. Between 50 and 100 ms is acceptable for most tasks but noticeable in video calls or gaming. Over 100 ms becomes frustrating for real-time activities. Over 150 ms is poor.

Latency requirements for common household tasks

Different activities tolerate different amounts of latency. Knowing what you actually need helps you decide whether to invest in changes.

Email, web browsing, and streaming video: These tolerate latency up to 100 ms without noticeable problems. You are not waiting for real-time feedback, so a slight delay does not matter.

Video calls: Latency above 50 ms becomes noticeable. Above 100 ms, conversations feel awkward because of the delay between speaking and hearing a response. Aim for under 50 ms if you do frequent video calls.

Online gaming: Competitive games are sensitive to latency. Under 50 ms feels responsive. 50 to 100 ms is playable but puts you at a disadvantage. Over 100 ms makes fast-paced games frustrating. Casual games tolerate higher latency.

Smart home devices: Locks, cameras, and thermostats usually tolerate 100 to 200 ms without problems, because you do not expect when ready response. But if latency is very high (over 500 ms), devices may time out and fail to respond at all.

Ways to lower latency on your home network

If your latency is higher than you need, start with the easiest changes first. Some cost nothing; others require equipment.

Switch to a wired Ethernet connection if the device supports it. This removes Wi-Fi delay entirely. If wiring is not practical, move closer to your router or switch to the 5 GHz or 6 GHz band, which has less interference and lower latency than 2.4 GHz. Most modern routers broadcast both bands; your device may need to be told to prefer the faster one.

Restart your router. Routers accumulate temporary data and can become sluggish. Unplugging it for 30 seconds and plugging it back in often improves latency slightly.

Reduce network congestion. If other devices are downloading large files or streaming video, ask them to pause or schedule heavy use for off-peak times. Disable automatic updates on devices you are not using.

If latency is consistently high even when nothing else is using the network, contact your internet provider. They can check whether the problem is on their side or yours. Some providers offer different service tiers with lower latency; others may need to upgrade your modem or line quality.

When latency is a sign of a security problem

Unusually high latency can sometimes indicate a security issue, though it is rare. If your latency suddenly spikes without explanation, or if it is high only to certain servers, malware or a compromised device on your network might be consuming bandwidth.

Run a quick check: disconnect all devices except one, then measure latency again. If it drops significantly, one of the disconnected devices is the culprit. If it stays high, the problem is likely your internet provider's network or the destination server, not your home network.

More commonly, high latency is straightforward a sign of distance, congestion, or an older router. But if you notice latency spikes paired with other odd behavior — devices running slowly, unexpected network activity, or unfamiliar programs running — that is worth investigating with updated antivirus software or a full network scan.

Frequently Asked Questions

Is 50 ms latency good?

Yes. Latency under 50 ms is considered good for most household tasks, including video calls and casual gaming. For competitive gaming or professional video work, under 20 ms is better. Anything over 100 ms becomes noticeable in real-time activities.

Can I lower latency by changing my internet provider?

Sometimes. Latency depends partly on your provider's network infrastructure and routing. If you are far from their servers, switching to a provider with local servers may help. But distance and geography matter more than provider choice. Fiber providers often have lower latency than cable or DSL, but not always.

Does a faster router reduce latency?

A newer router can reduce latency slightly, especially if your current one is old or overwhelmed. But a new router will not fix latency caused by your internet provider's network or distance to the server. It helps most when congestion on your home network is the problem.

Why is my latency higher on Wi-Fi than on Ethernet?

Wi-Fi adds delay because radio signals travel slower than wired signals and are more prone to interference. The difference is usually 10 to 30 ms. If latency matters for what you are doing, use Ethernet. If you must use Wi-Fi, stay close to the router and use the 5 GHz or 6 GHz band.

Can I test latency to a specific website?

Yes. Use a ping tool and enter the website's domain name instead of an IP address — for example, ping google.com. This shows you latency to that specific server. Keep in mind that latency to a website can vary depending on where their servers are located and how your provider routes traffic to them.