Add a Perfs section in README.md

README.md

@@ -1,4 +1,27 @@
 # osmpbfreader-rs [![Build Status](https://travis-ci.org/TeXitoi/osmpbfreader-rs.svg?branch=master)](https://travis-ci.org/TeXitoi/osmpbfreader-rs)
 
+## Presentation
+
 Read OpenStreetMap PBF files in rust. The goal is to propose something
 similar to https://github.com/CanalTP/libosmpbfreader for rust.
+
+## Perfs
+
+Using the `count` example compiled in release mode:
+```
+$ cat /proc/cpuinfo | grep name | head -1
+model name	: Intel(R) Core(TM) i7-4702HQ CPU @ 2.20GHz
+$ rustc --version
+rustc 0.13.0-nightly (fac5a0767 2014-11-26 22:37:06 +0000)
+$ ls -sh france-latest.osm.pbf
+2,9G france-latest.osm.pbf
+$ time ./target/release/count-osm france-latest.osm.pbf admin_level 8
+counting objects with tags["admin_level"] = "8"...
+51 nodes, mean coord: 46.337052, 2.832865.
+105306 ways, mean |nodes|: 75.646221
+37229 relations, mean |references|: 8.220446
+
+real	5m30.785s
+user	5m18.264s
+sys 	0m11.944s
+```