Lanbench Upd Jun 2026

Note: You will never see exactly 100% of the theoretical speed due to standard TCP/IP protocol overhead, which consumes roughly 2% to 5% of the total bandwidth. Common Troubleshooting Use Cases

| Metric | What it measures | Good Threshold (LAN) | | :--- | :--- | :--- | | | Latency from request send to first token back. | < 100ms for streaming. | | Token/s (throughput) | Tokens generated per second across the network. | > 80% of local speed. | | P95 Latency | Worst-case latency for 95% of requests. | < 500ms for interactive use. | | Request Failures | Timeouts or connection resets. | 0% on a healthy LAN. |

Eliminates the need for command-line syntax used in tools like Iperf.

Elias fired up the server instance on a high-end workstation in Wing A, setting it to "Listen" on the default port. He then jogged over to Wing B, opened the client on a second machine, and entered the IP address. LANBench

Developed by Zach Saw and engineered on the Winsock 2.2 API , this lightweight tool measures Local Area Network (LAN) throughput by utilizing an optimized multithreaded architecture. It bypasses typical system bottlenecks, such as slow read/write speeds of storage drives, by generating and sending synthetic traffic entirely within system memory (RAM).

: It can simulate multiple simultaneous connections to stress-test network equipment like routers, switches, and network interface cards (NICs).

Uses the Windows I/O completion port for efficient multi-threading with negligible CPU impact. Note: You will never see exactly 100% of

LANBench

LANBench isolates your physical network hardware from application overhead to deliver accurate performance metrics. Key design features include:

If you are planning to test your network setup, let me know: | | Token/s (throughput) | Tokens generated per

Choose between Send Only , Receive Only , or Send and Receive (simultaneous bidirectional testing). Click OK and then hit the Test button to begin. Interpreting Results

Using LANBench is straightforward. Here’s a step-by-step guide to get you started:

LANBench operates on a simple client-server architecture. To use it, you run the executable file on two separate machines connected to the same network. One machine is configured as the server, listening for incoming connections, while the other acts as the client, actively sending and receiving test packets. Because it runs entirely within the system's random-access memory (RAM), it completely eliminates storage drive bottlenecks, providing a pure measurement of your physical network infrastructure. Key Features of LANBench

If you are looking for a reliable, no-nonsense tool to test your LAN speed, LANBench is an excellent choice. If you'd like to dive deeper, How to interpret variations? Comparison with iperf3 for specific scenarios?