End-to-end throughput
Network bottleneck calculator
A connection is only as fast as its slowest stage. Compare the full path and identify what actually limits performance.
Your inputs
Calculated result
1,000 Mbps effective
Router throughput limits the path to approximately 1,000 Mbps instead of the 2,000 Mbps target.
Bottleneck stage
Router throughput
Target delivered
50%
How to use this result
- • Use measured or specified routing throughput, especially when IDS/IPS is enabled.
- • Wi-Fi client rates are variable and usually lower than advertised link rates.
- • Upgrading a stage above the current bottleneck will not improve the complete path by itself.
How the calculation works
- List every stage between the internet and the device: internet plan, router routing throughput, switch or uplink speed, and the client's link.
- The effective speed is the lowest of those values; that stage is the bottleneck.
- If the effective speed is below your target (normally the internet plan), the result is a warning naming the limiting stage.
Worked example
2 Gbps fiber behind a router with 1 Gbps throughput
- Internet: 2,000 Mbps
- Router throughput: 1,000 Mbps
- Switch uplink and client: 2,500 Mbps
Router throughput limits the path to approximately 1,000 Mbps instead of the 2,000 Mbps target. Only 50% of the plan reaches the client.
Common questions
Why does my router's throughput drop with security features on?
IDS/IPS, VPNs and traffic inspection are processed by the router's CPU. Manufacturers often publish a lower throughput figure with these enabled; use that figure if you plan to turn them on.
Will a faster switch fix a slow internet connection?
Only if the switch is the slowest stage. Upgrading anything that is already faster than the bottleneck does not improve the end-to-end speed.
What should I enter for a Wi-Fi client?
Use a realistic measured rate rather than the advertised link rate. Real Wi-Fi throughput depends on distance, walls, interference and the client's own radio.