add benchmark to readme

README.md

@@ -1,2 +1,33 @@
-# Hochwasser
-Moderately efficient client for Pixelflut (https://cccgoe.de/wiki/Pixelflut)
+# 🌊🌊🌊 Hochwasser 🌊🤽🌊
+Highly efficient client for [Pixelflut]:
+Faster than [sturmflut]!
+
+Can currently only send a single picture though.
+
+[pixelflut]: https://cccgoe.de/wiki/Pixelflut
+[sturmflut]: https://github.com/TobleMiner/sturmflut
+
+## benchmark
+The following benchmark was run on a max-spec X280 against version [d4c574b].
+
+I could not figure out what the performance bottleneck is, but it is not CPU limited.
+
+To reproduce, run the following commands in separate shells:
+
+```sh
+iperf -s -p 1337
+go run main.go -image benchmark/test.png -connection 10
+```
+
+![screenshot: 55 Gbps of hochwasser](benchmarks/benchmark_x280.png)
+
+55 Gbps on average! 🌊🌊🌊
+
+[sturmflut] (`./sturmflut 127.0.0.1:1337 benchmark/test.png -t 10`, version `8ec6ee9`) managed to get 48 Gpbs throughput on this system.
+
+> Hint: Benchmarking throughput against the [pixelnuke][pixelflut_gh] is pointless,
+  as performance is then CPU-limited to ~1 Gbps by the server.
+  Using [iperf] removes the server limitation.
+
+[d4c574b]: https://github.com/SpeckiJ/Hochwasser/commit/d4c574be103a7bad69349f29402694f51058184c
+[iperf]: https://iperf.fr/