Update index.rst

Author: JarryShaw

docs/source/index.rst

@@ -102,7 +102,7 @@ Engine Comparison
 -----------------
 
 Due to the general overhead of :mod:`pcapkit`, its extraction procedure takes
-around *0.96* milliseconds per packet, which is already impressive but not enough
+around *0.2* milliseconds per packet, which is already impressive but not enough
 comparing to other popular extration engines availbale on the market, given the
 fact that :mod:`pcapkit` is a **comprehensive** packet processing module.