diff --git a/.changeset/perf-rest-props-set.md b/.changeset/perf-rest-props-set.md
new file mode 100644
index 0000000000..9362e7489e
--- /dev/null
+++ b/.changeset/perf-rest-props-set.md
@@ -0,0 +1,5 @@
+---
+"svelte": patch
+---
+
+perf: use `Set` for rest-prop exclude lists in server, legacy, and shared utils