diff --git a/.build.sh b/.build.sh
index 31b14ea..d16198c 100644
--- a/.build.sh
+++ b/.build.sh
@@ -17,6 +17,13 @@ clone () {
   fi
 }
 
+# optimizations
+set_cflags () {
+  export \
+    CFLAGS="-O3" CPPFLAGS="-O3" LDFLAGS="-Wl,-O3 -Wl,-S" \
+    RUSTFLAGS="-C target-cpu=native"
+}
+
 # make -j12
 make_maxthreads() {
   [ -v JOBS ] || JOBS=$(nproc || echo 4)
diff --git a/build_dig.sh b/build_dig.sh
index bf3461e..35c6ebf 100755
--- a/build_dig.sh
+++ b/build_dig.sh
@@ -15,7 +15,7 @@ clone https://gitlab.isc.org/isc-projects/bind9.git bind9
 
 cd bind9
 trap 'cd ..' EXIT
-export CFLAGS="-O3" CPPFLAGS="-O3"
+set_cflags
 
 echo
 echo '==> autoreconf -fi'
diff --git a/build_drill.sh b/build_drill.sh
index cf020a2..03f369a 100755
--- a/build_drill.sh
+++ b/build_drill.sh
@@ -16,7 +16,7 @@ clone https://github.com/NLnetLabs/ldns.git ldns
 
 cd ldns
 trap 'cd ..' EXIT
-export CFLAGS="-O3"
+set_cflags
 
 echo
 echo '==> libtoolize -ci'
diff --git a/build_hr.sh b/build_hr.sh
index 9fb25f3..d5a5ddc 100755
--- a/build_hr.sh
+++ b/build_hr.sh
@@ -13,6 +13,7 @@ clone https://github.com/hickory-dns/hickory-dns.git hickory-dns
 
 cd hickory-dns
 trap 'cd ..' EXIT
+set_cflags
 
 echo
 echo '==> Building resolve'