diff --git a/.changeset/tidy-elements-rest.md b/.changeset/tidy-elements-rest.md
new file mode 100644
index 0000000000..b6a7861e1f
--- /dev/null
+++ b/.changeset/tidy-elements-rest.md
@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+perf: exclude custom element runtime code from ordinary client bundles