diff -urN WRF-4.z.orig/arch/configure.defaults WRF-4.z/arch/configure.defaults
--- WRF-4.z.orig/arch/configure.defaults	2021-01-15 17:21:58.000000000 +0000
+++ WRF-4.z/arch/configure.defaults	2022-09-20 07:53:13.049991397 +0000
@@ -66,7 +66,7 @@
 LDFLAGS_LOCAL   =
 CPLUSPLUSLIB    =       
 ESMF_LDFLAG     =       $(CPLUSPLUSLIB)
-FCOPTIM         =       -O2 -ftree-vectorize -funroll-loops
+FCOPTIM         =       -Ofast -mcpu=native -funroll-loops -fno-expensive-optimizations -fno-reciprocal-math -fsigned-zeros -fno-unsafe-math-optimizations
 FCREDUCEDOPT	=       $(FCOPTIM)
 FCNOOPT         =       -O0
 FCDEBUG         =       # -g $(FCNOOPT)  # -fbacktrace -ggdb -fcheck=bounds,do,mem,pointer -ffpe-trap=invalid,zero,overflow