What is network latency, and how to check and optimize it?

<p style="line-height: 2;"><span style="font-size: 16px;">In daily web browsing or online gaming, we occasionally encounter issues such as slow page loading, video stuttering, or delayed response to actions. These problems are often related to "network latency."</span></p><p style="line-height: 2;"><br></p><p style="line-height: 2;"><span style="font-size: 24px;"><strong>I. What is network latency?</strong></span></p><p style="line-height: 2;"><span style="font-size: 16px;">Simply put, network latency is the time it takes for data to travel from your device to a target server and back. It is usually measured in milliseconds (ms). Think of it like sending a letter and waiting for a reply—the total time from sending to receiving is the latency. The lower the latency, the faster the network response and the smoother the experience; the higher the latency, the more noticeable the lag and slowness. Generally speaking, 0–50ms is excellent, 50–100ms is good, 100–150ms is acceptable, and above 200ms will affect most real-time interactions.</span></p><p style="line-height: 2;"><br></p><p style="line-height: 2;"><span style="font-size: 24px;"><strong>II. How to check network latency?</strong></span></p><p style="line-height: 2;"><span style="font-size: 16px;">The most common method is using the ping command:</span></p><p style="line-height: 2;"><br></p><p style="line-height: 2;"><span style="font-size: 16px;">Windows: Press Win+R, type cmd and press Enter. In the command window, type ping &lt;target address&gt; -t (e.g., ping www.baidu.com -t). The system will continuously display response times and packet loss.</span></p><p style="line-height: 2;"><br></p><p style="line-height: 2;"><span style="font-size: 16px;">macOS/Linux: Open the terminal and type ping &lt;target address&gt;.</span></p><p style="line-height: 2;"><br></p><p style="line-height: 2;"><span style="font-size: 16px;">Observe the "time=" value; the lower the average, the better. If you see "Request timed out" or significant packet loss, it indicates an unstable network. In addition, you can use online speed test websites (e.g., Speedtest) or built‑in network detection features in games. If you wish to test latency from different network nodes, you can also use </span><a href="https://www.b2proxy.com/pricing/residential-proxies" target="_blank"><span style="color: rgb(9, 109, 217); font-size: 16px;">residential proxy</span></a><span style="font-size: 16px;"> IPs. By switching between</span><span style="color: rgb(9, 109, 217); font-size: 16px;"> </span><a href="https://www.b2proxy.com/" target="_blank"><span style="color: rgb(9, 109, 217); font-size: 16px;">proxy IPs</span></a><span style="font-size: 16px;"> from different regions and observing the latency to the same server, you can determine whether high latency is caused by local routing policies.</span></p><p style="line-height: 2;"><br></p><p style="line-height: 2;"><span style="font-size: 24px;"><strong>III. How to optimize network latency?</strong></span></p><p style="line-height: 2;"><span style="font-size: 16px;">If you find that latency is too high, try the following methods:</span></p><p style="line-height: 2;"><br></p><p style="line-height: 2;"><span style="font-size: 16px;">1. Switch to a wired connection: Wi‑Fi is susceptible to interference. Using an Ethernet cable to connect directly to your router can significantly reduce latency and fluctuations.</span></p><p style="line-height: 2;"><span style="font-size: 16px;">2. Close background programs that consume bandwidth: Such as video streaming, cloud drive sync, system updates, etc. These compete for network capacity.</span></p><p style="line-height: 2;"><span style="font-size: 16px;">3. Restart your network equipment: Modems and routers may overheat or suffer from cache overflow after running for a long time. Unplugging them for 1‑2 minutes often works.</span></p><p style="line-height: 2;"><span style="font-size: 16px;">4. Change your DNS server: Use faster public DNS servers, such as Alibaba DNS (223.5.5.5) or Google DNS (8.8.8.8), to reduce resolution time.</span></p><p style="line-height: 2;"><span style="font-size: 16px;">5. </span><a href="https://www.b2proxy.com/blog/one-trick-for-whole-house-proxy-how-to-set-up-a-unified-proxy-ip-on-your-router.html" target="_blank"><span style="color: rgb(9, 109, 217); font-size: 16px;">Optimize router</span></a><span style="color: rgb(9, 109, 217); font-size: 16px;"> </span><span style="font-size: 16px;">placement and frequency band: Stay as close to the router as possible and prioritize the 5GHz band (which has less interference than 2.4GHz).</span></p><p style="line-height: 2;"><span style="font-size: 16px;">6. Upgrade your internet plan or equipment: If multiple devices are using the network at home, insufficient bandwidth or an outdated router can become a bottleneck.</span></p><p style="line-height: 2;"><br></p><p style="line-height: 2;"><span style="font-size: 16px;">Network latency directly affects your online experience. With regular monitoring and targeted optimizations, most problems can be resolved. When latency is abnormal, follow the steps above one by one to restore a smooth connection.</span></p>