diff --git a/Makefile b/Makefile
--- a/Makefile
+++ b/Makefile
@@ -437,7 +437,7 @@ endif
 HOSTPKG_CONFIG	= pkg-config

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

@@ -461,7 +461,7 @@ endif
 
 KBUILD_HOSTCFLAGS   := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) \
 		       $(HOSTCFLAGS) -I $(srctree)/scripts/include
-KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) \
+KBUILD_HOSTCXXFLAGS := -Wall -O3 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) \
 		       -I $(srctree)/scripts/include
 KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \
 			-Zallow-features= $(HOSTRUSTFLAGS)
@@ -954,7 +954,7 @@
 KBUILD_RUSTFLAGS += $(rustflags64-y)
 
 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
-KBUILD_CFLAGS += -O2
+KBUILD_CFLAGS += -O3
 KBUILD_RUSTFLAGS += -Copt-level=2
 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 KBUILD_CFLAGS += -Os
diff --git a/init/Kconfig b/init/Kconfig
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1430,10 +1430,10 @@ 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