diff --git a/TODO.md b/TODO.md
index 090ae2f..008d0cb 100644
--- a/TODO.md
+++ b/TODO.md
@@ -2,7 +2,6 @@
 
 ## General
 
-* rustflags for scripts in own .env file or similar
 * automatic tests running real clients in container?
 
 ## aquatic_http_load_test
diff --git a/scripts/bench-udp-handlers.sh b/scripts/bench-udp-handlers.sh
index df9b9ce..f273454 100755
--- a/scripts/bench-udp-handlers.sh
+++ b/scripts/bench-udp-handlers.sh
@@ -1,11 +1,5 @@
 #!/bin/sh
 
-# Compile with target-cpu=native but without AVX512 features, since they
-# decrease performance.
-
-DISABLE_AVX512=$(rustc --print target-features | grep "    avx512" |
-    awk '{print $1}'  | sed 's/^/-C target-feature=-/' | xargs)
-
-export RUSTFLAGS="-C target-cpu=native $DISABLE_AVX512"
+. ./scripts/env-native-cpu-without-avx-512
 
 cargo run --release --bin aquatic_udp_bench -- $@
\ No newline at end of file
diff --git a/scripts/criterion/aquatic-http-announce-response-to-bytes.sh b/scripts/criterion/aquatic-http-announce-response-to-bytes.sh
index a5ed350..9785363 100755
--- a/scripts/criterion/aquatic-http-announce-response-to-bytes.sh
+++ b/scripts/criterion/aquatic-http-announce-response-to-bytes.sh
@@ -3,7 +3,7 @@
 
 set -e
 
-export RUSTFLAGS="-C target-cpu=native"
+. ./scripts/env-native-cpu-without-avx-512
 
 cargo bench --bench bench_announce_response_to_bytes -- --noplot --baseline latest
 
diff --git a/scripts/criterion/aquatic-http-request-from-bytes.sh b/scripts/criterion/aquatic-http-request-from-bytes.sh
index 00d2589..4990a03 100755
--- a/scripts/criterion/aquatic-http-request-from-bytes.sh
+++ b/scripts/criterion/aquatic-http-request-from-bytes.sh
@@ -3,7 +3,7 @@
 
 set -e
 
-export RUSTFLAGS="-C target-cpu=native"
+. ./scripts/env-native-cpu-without-avx-512
 
 cargo bench --bench bench_request_from_bytes -- --noplot --baseline latest
 
diff --git a/scripts/criterion/aquatic-ws-deserialize-announce-request.sh b/scripts/criterion/aquatic-ws-deserialize-announce-request.sh
index 3ed70dd..48dbc01 100755
--- a/scripts/criterion/aquatic-ws-deserialize-announce-request.sh
+++ b/scripts/criterion/aquatic-ws-deserialize-announce-request.sh
@@ -3,13 +3,7 @@
 
 set -e
 
-# Compile with target-cpu=native but without AVX512 features, since they
-# decrease performance.
-
-DISABLE_AVX512=$(rustc --print target-features | grep "    avx512" |
-    awk '{print $1}'  | sed 's/^/-C target-feature=-/' | xargs)
-
-export RUSTFLAGS="-C target-cpu=native $DISABLE_AVX512"
+. ./scripts/env-native-cpu-without-avx-512
 
 cargo bench --bench bench_deserialize_announce_request -- --noplot --baseline latest
 
diff --git a/scripts/env-native-cpu-without-avx-512 b/scripts/env-native-cpu-without-avx-512
new file mode 100644
index 0000000..68f7751
--- /dev/null
+++ b/scripts/env-native-cpu-without-avx-512
@@ -0,0 +1,9 @@
+#!/bin/sh
+
+# Compile with target-cpu=native but without AVX512 features, since they
+# decrease performance.
+
+DISABLE_AVX512=$(rustc --print target-features | grep "    avx512" |
+    awk '{print $1}'  | sed 's/^/-C target-feature=-/' | xargs)
+
+export RUSTFLAGS="-C target-cpu=native $DISABLE_AVX512"
\ No newline at end of file
diff --git a/scripts/run-aquatic-http.sh b/scripts/run-aquatic-http.sh
index 343b6de..495a259 100755
--- a/scripts/run-aquatic-http.sh
+++ b/scripts/run-aquatic-http.sh
@@ -1,5 +1,5 @@
 #!/bin/sh 
 
-. scripts/env-native-cpu-wihout-avx-512
+. ./scripts/env-native-cpu-without-avx-512
 
 cargo run --release --bin aquatic_http -- $@
diff --git a/scripts/run-aquatic-udp.sh b/scripts/run-aquatic-udp.sh
index 57f27f3..6ccfb86 100755
--- a/scripts/run-aquatic-udp.sh
+++ b/scripts/run-aquatic-udp.sh
@@ -1,11 +1,5 @@
 #!/bin/sh 
 
-# Compile with target-cpu=native but without AVX512 features, since they
-# decrease performance.
-
-DISABLE_AVX512=$(rustc --print target-features | grep "    avx512" |
-    awk '{print $1}'  | sed 's/^/-C target-feature=-/' | xargs)
-
-export RUSTFLAGS="-C target-cpu=native $DISABLE_AVX512"
+. ./scripts/env-native-cpu-without-avx-512
 
 cargo run --release --bin aquatic_udp -- $@
diff --git a/scripts/run-load-test-http.sh b/scripts/run-load-test-http.sh
index e8d1a24..86edc66 100755
--- a/scripts/run-load-test-http.sh
+++ b/scripts/run-load-test-http.sh
@@ -1,11 +1,5 @@
 #!/bin/sh 
 
-# Compile with target-cpu=native but without AVX512 features, since they
-# decrease performance.
-
-DISABLE_AVX512=$(rustc --print target-features | grep "    avx512" |
-    awk '{print $1}'  | sed 's/^/-C target-feature=-/' | xargs)
-
-export RUSTFLAGS="-C target-cpu=native $DISABLE_AVX512"
+. ./scripts/env-native-cpu-without-avx-512
 
 cargo run --release --bin aquatic_http_load_test -- $@
\ No newline at end of file
diff --git a/scripts/run-load-test-udp.sh b/scripts/run-load-test-udp.sh
index 90f30cc..3946878 100755
--- a/scripts/run-load-test-udp.sh
+++ b/scripts/run-load-test-udp.sh
@@ -1,11 +1,5 @@
 #!/bin/sh 
 
-# Compile with target-cpu=native but without AVX512 features, since they
-# decrease performance.
-
-DISABLE_AVX512=$(rustc --print target-features | grep "    avx512" |
-    awk '{print $1}'  | sed 's/^/-C target-feature=-/' | xargs)
-
-export RUSTFLAGS="-C target-cpu=native $DISABLE_AVX512"
+. ./scripts/env-native-cpu-without-avx-512
 
 cargo run --release --bin aquatic_udp_load_test -- $@
diff --git a/scripts/run-load-test-ws.sh b/scripts/run-load-test-ws.sh
index c1adfa0..823c195 100755
--- a/scripts/run-load-test-ws.sh
+++ b/scripts/run-load-test-ws.sh
@@ -1,11 +1,5 @@
 #!/bin/sh 
 
-# Compile with target-cpu=native but without AVX512 features, since they
-# decrease performance.
-
-DISABLE_AVX512=$(rustc --print target-features | grep "    avx512" |
-    awk '{print $1}'  | sed 's/^/-C target-feature=-/' | xargs)
-
-export RUSTFLAGS="-C target-cpu=native $DISABLE_AVX512"
+. ./scripts/env-native-cpu-without-avx-512
 
 cargo run --release --bin aquatic_ws_load_test -- $@
\ No newline at end of file