diff --git a/changelog.d/release-tuning.change b/changelog.d/release-tuning.change
new file mode 100644
index 000000000..bf9abc3ad
--- /dev/null
+++ b/changelog.d/release-tuning.change
@@ -0,0 +1 @@
+Tuning for release builds to lower CPU usage.
diff --git a/rel/vm.args.eex b/rel/vm.args.eex
index 71e803264..8e38fee4b 100644
--- a/rel/vm.args.eex
+++ b/rel/vm.args.eex
@@ -9,3 +9,8 @@
 
 ## Tweak GC to run more often
 ##-env ERL_FULLSWEEP_AFTER 10
+
+# Disable wasteful busywait.
++sbwt none
++sbwtdcpu none
++sbwtdio none