Update README.md

Author: electronstudio

README.md

@@ -151,12 +151,17 @@ statically link and use in non-free / proprietary / commercial projects!
 
 # Performance
 
-For fastest performance use Pypy rather than standard Python.
+If you need more performance, do in this order:
 
-Every call to C is costly, so it's slightly faster if you use Python data structures and functions when calculating
+1. Use Pypy rather than standard CPython.  It is much, much faster and will make more difference than any other optimisations you might do.
+
+2. Every call to C is costly, so it's slightly faster if you use Python data structures and functions when calculating
 in your update loop
 and then only convert them to C data structures when you have to call the C functions for drawing.
 
+3. The raylib.* functions are potentially 1.5x faster than the pyray.* equivalents, so if you need a tiny bit more performance
+you can switch your inner loop functions to these.
+
 ## Bunnymark
 
 
@@ -184,4 +189,4 @@ You can create a standalone binary using the Nuitka compiler.  For example, here
 [RetroWar: 8-bit Party Battle](https://store.steampowered.com/app/664240/RetroWar_8bit_Party_Battle/?git) is out now.  Defeat up to 15 of your friends in a tournament of 80s-inspired retro mini games.
 
 [Coding Games With Pygame Zero & Python](https://github.com/electronstudio/pygame-zero-book) is 
-a book for Python beginners.
+a book for Python beginners.