diff --git a/platformio.ini b/platformio.ini
index b7f68fd..8322ae1 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -93,7 +93,11 @@ build_flags =
 	-D CORE_DEBUG_LEVEL=4
 	-D register=
 	-std=gnu++2a
-build_unflags = -std=gnu++11
+    -flto=auto ; Enable Link Time Optimization
+    -O3
+build_unflags = 
+    -std=gnu++11
+    -fno-lto
 build_src_flags = 
 	-Wformat=2
 	-Wformat-truncation