diff --git a/Makefile b/Makefile
--- a/Makefile
+++ b/Makefile
@@ -442,13 +442,13 @@ endif
 HOSTPKG_CONFIG	= pkg-config

 KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
-			 -O2 -fomit-frame-pointer -std=gnu11 \
+			 -O3 -fomit-frame-pointer -std=gnu11 \
			 -Wdeclaration-after-statement
 KBUILD_USERCFLAGS  := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS)
 KBUILD_USERLDFLAGS := $(USERLDFLAGS)

 KBUILD_HOSTCFLAGS   := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
-KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
+KBUILD_HOSTCXXFLAGS := -Wall -O3 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
 KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
 KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)

@@ -757,7 +757,7 @@ KBUILD_CFLAGS       += $(call cc-disable-warning, format-overflow)
 KBUILD_CFLAGS  += $(call cc-disable-warning, address-of-packed-member)

 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
-KBUILD_CFLAGS += -O2
+KBUILD_CFLAGS += -O3
 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 KBUILD_CFLAGS += -Os
 endif
diff --git a/init/Kconfig b/init/Kconfig
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1401,10 +1401,10 @@ choice
 	default CC_OPTIMIZE_FOR_PERFORMANCE

 config CC_OPTIMIZE_FOR_PERFORMANCE
-	bool "Optimize for performance (-O2)"
+	bool "Optimize for performance (-O3)"
 	help
 	  This is the default optimization level for the kernel, building
-	  with the "-O2" compiler flag for best performance and most
+	  with the "-O3" compiler flag for best performance and most
 	  helpful compile-time warnings.

 config CC_OPTIMIZE_FOR_SIZE