Latency Explained (Ping & Response Time)

Network latency is the delay between sending data and receiving a response over the internet.

It is measured in milliseconds (ms) and is usually shown as Ping on a speed test.

Lower latency means faster response times.

Higher latency means more delay.

Why Latency Matters

Latency mainly affects real-time services such as:

• Video calls
• Voice calls
• Online gaming
• Remote desktop or VPN connections

High latency can cause:

• Lag
• Slow loading
• Buffering
• Audio or video dropouts

Low vs High Latency

Low latency

Data travels quickly and feels responsive.

High latency

Data takes longer to travel and causes delays.

What Causes Latency?

1. Distance

The further data has to travel, the longer it takes.

UK servers usually give lower latency than overseas servers.

2. Websites and Applications

Sites that load large files or content from many different services can feel slower.

3. Device Performance

Latency can sometimes be caused by the device itself, for example:

• Low memory
• Too many apps running
• Outdated software

Keeping devices updated and closing unused apps can help.

4. Network Equipment

Routers, Wi-Fi access points, or other network equipment can add delay if they are:

• Overloaded
• Faulty
• Poorly positioned
• Misconfigured

What Is Acceptable Latency?

As a general guide:

• Under 50 ms – Very good
• 50–100 ms – Normal
• 100–150 ms – May feel slow
• Over 150 ms – Likely to cause noticeable lag

Gaming and video calls work best under 100 ms.

What Is Packet Loss?

Packet loss happens when data does not reach its destination.

Real-time services are very sensitive to this.

Even small amounts (around 1–2%) can cause:

• Audio dropouts
• Video freezing
• Lag in games

How to Test Latency

For the most accurate result:

• Use a wired (Ethernet) connection
• Pause other downloads or streaming
• Run a speed test

Wi-Fi can add extra delay due to interference, so results may be higher over wireless.