diff --git a/config/initializers/yjit.rb b/config/initializers/yjit.rb
new file mode 100644
index 00000000..8a8b5f56
--- /dev/null
+++ b/config/initializers/yjit.rb
@@ -0,0 +1,7 @@
+Rails.application.configure do
+  # YJIT slows down the test suite and doesn't really help in development
+  # It will be disabled by default in Rails 8.1
+  # https://github.com/rails/rails/pull/53746
+
+  config.yjit = !Rails.env.local?
+end