diff --git a/e2e_test/backfill/adaptive-rate-limit/high-baseline-latency.slt b/e2e_test/backfill/adaptive-rate-limit/amplification-10000-multi-join.slt
similarity index 100%
rename from e2e_test/backfill/adaptive-rate-limit/high-baseline-latency.slt
rename to e2e_test/backfill/adaptive-rate-limit/amplification-10000-multi-join.slt
diff --git a/e2e_test/backfill/adaptive-rate-limit/slow-udf.slt b/e2e_test/backfill/adaptive-rate-limit/slow-udf.slt
new file mode 100644
index 0000000000000..707b16bf0a4db
--- /dev/null
+++ b/e2e_test/backfill/adaptive-rate-limit/slow-udf.slt
@@ -0,0 +1,16 @@
+statement ok
+create table t(v1 int);
+
+statement ok
+insert into t select 1 from generate_series(1, 1000000);
+
+statement ok
+CREATE FUNCTION delay(secs int) RETURNS int LANGUAGE python AS $$
+def delay(n):
+    import time
+    time.sleep(n)
+    return n
+$$;
+
+statement ok
+create materialized view m1 as select delay(v1) from t;