Slow network speed to server — diagnostics

Summary

If data transfer between your computer and the server is slow: check the route (MTR/traceroute), channel speed (iperf3), and network interface load.

Applies to:
✔ VPS
✔ Dedicated servers
✔ Linux, Windows

Step 1: check route

mtr -r -c 100 SERVER_IP

Windows:

pathping SERVER_IP

Step 2: check latency

ping -c 10 SERVER_IP

Normal latency: same country 5-30ms, cross-continent 80-200ms.

Step 3: speed test on server

wget -O /dev/null http://speedtest.tele2.net/10MB.zip 2>&1 | tail -2

Step 4: test between two points (iperf3)

On server:

apt install iperf3 -y

iperf3 -s

From your computer:

iperf3 -c SERVER_IP

Step 5: check network interface load

apt install nload -y

nload

Step 6: check traffic limit

Check traffic usage in the control panel. Speed may be throttled if the limit is exceeded.

Verification

ping -c 10 SERVER_IP

Latency should be stable with 0% packet loss.

If MTR shows losses at intermediate nodes or channel speed is significantly below the plan, open a support ticket. Attach MTR results (at least 100 packets).