...
diff --git a/src/perf/TestCopyPerf.java b/src/perf/TestCopyPerf.java
index 2eb5f04..631dd9b 100644
--- a/src/perf/TestCopyPerf.java
+++ b/src/perf/TestCopyPerf.java
@@ -22,7 +22,8 @@
_jsonFactory = new JsonFactory();
_smileFactory = new SmileFactory();
// whether to use back-refs for field names has measurable impact on ser/deser (but different direction):
- _smileFactory.configure(SmileGenerator.Feature.CHECK_SHARED_NAMES, false);
+ // _smileFactory.configure(SmileGenerator.Feature.CHECK_SHARED_NAMES, false);
+ _smileFactory.configure(SmileGenerator.Feature.CHECK_SHARED_NAMES, true);
FileInputStream fis = new FileInputStream(f);
ObjectMapper mapper = new ObjectMapper();
JsonParser jp = _jsonFactory.createJsonParser(fis);