From 6934eccc76b23404b727a94cb05a6067c24aa0f4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Miloslav=20=C4=8C=C3=AD=C5=BE?= <tastyfish@seznam.cz>
Date: Tue, 25 Jun 2019 15:22:42 +0000
Subject: [PATCH] Update README.md

---
 README.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/README.md b/README.md
index bc7678a..eeee3a4 100644
--- a/README.md
+++ b/README.md
@@ -59,6 +59,8 @@ interface.
 how to use
 ----------
 
+**Don't forget to compile with -O3!** This drastically improves performance.
+
 For start take a look at the [testTerminal.c](https://gitlab.com/drummyfish/raycastlib/blob/master/programs/testTerminal.c) program.
 It is only a little bit more complex than a simple hello world.