Diagnosing slow networks: a methodical approach

"The network is slow" can mean many things. A methodical approach finds the cause faster than guesswork.

Define the problem

Who is affected, which applications, since when, and at what times?

Isolate layer by layer

1. **Device:** does another device in the same place work better?
2. **Wi-Fi:** is it better on a cable?
3. **Local network:** are internal systems slow too?
4. **Internet:** is the internet link saturated or degraded?
5. **Application:** is one service slow while others are fine?

Look at data

Switch and firewall statistics, Wi-Fi utilisation and internet usage graphs show where congestion occurs.

Common causes

Overloaded Wi-Fi, a failing cable or port, a device saturating the internet link, or an application problem.

Fix and verify

Change one thing at a time and confirm the result with users.

See our network support services.