diff --git a/test_copybara.text b/test_copybara.text
new file mode 100644
index 00000000..51ff3616
--- /dev/null
+++ b/test_copybara.text
@@ -0,0 +1 @@
+text copybara, DO NOT SUBMIT
\ No newline at end of file
diff --git a/tpu_raiden/benchmarks/perf_core.py b/tpu_raiden/benchmarks/perf_core.py
index 7fdbdb8c..bca7e669 100644
--- a/tpu_raiden/benchmarks/perf_core.py
+++ b/tpu_raiden/benchmarks/perf_core.py
@@ -196,7 +196,8 @@ def once():
     t0 = time.perf_counter()
     manager.d2h(src_offsets_major_dim=offsets, dst_offsets_major_dim=offsets,
                 copy_sizes_major_dim=sizes).Await()
-    d2h = time.perf_counter() - t0
+    d2h = time.perf_counter() - t0 + 1.0 # 1s delay
+    time.sleep(1)
     gc.enable(); gc.collect()
     gc.disable()
     t0 = time.perf_counter()