diff -r b8f795bdfe9f -r a66062a205ae targets/toolchain_gcc.py
--- a/targets/toolchain_gcc.py	Fri May 25 17:40:29 2018 +0300
+++ b/targets/toolchain_gcc.py	Fri May 25 18:34:05 2018 +0300
@@ -190,7 +190,7 @@
 
                         status, _result, _err_result = ProcessLogger(
                             self.CTRInstance.logger,
-                            "\"%s\" -c \"%s\" -o \"%s\" %s %s" %
+                            "\"%s\" -c \"%s\" -o \"%s\" -O2 %s %s" %
                             (self.compiler, CFile, objectfilename, Builder_CFLAGS, CFLAGS)
                         ).spin()