diff --git a/include/knowhere/prometheus_client.h b/include/knowhere/prometheus_client.h
index dcfa309b2..c7a517197 100644
--- a/include/knowhere/prometheus_client.h
+++ b/include/knowhere/prometheus_client.h
@@ -75,6 +75,7 @@ extern const std::unique_ptr<PrometheusClient> prometheusClient;
 #define DECLARE_PROMETHEUS_HISTOGRAM(name_histogram) extern prometheus::Histogram& name_histogram;
 
 DECLARE_PROMETHEUS_HISTOGRAM(knowhere_build_latency);
+DECLARE_PROMETHEUS_HISTOGRAM(knowhere_load_latency);
 DECLARE_PROMETHEUS_HISTOGRAM(knowhere_search_latency);
 DECLARE_PROMETHEUS_HISTOGRAM(knowhere_range_search_latency);
 DECLARE_PROMETHEUS_HISTOGRAM(knowhere_ann_iterator_init_latency);
diff --git a/src/common/index.cc b/src/common/index.cc
index c43279064..948164283 100644
--- a/src/common/index.cc
+++ b/src/common/index.cc
@@ -179,7 +179,17 @@ Index<T>::Deserialize(const BinarySet& binset, const Json& json) {
     if (res != Status::success) {
         return res;
     }
-    return this->node->Deserialize(binset, *cfg);
+
+#ifdef NOT_COMPILE_FOR_SWIG
+    TimeRecorder rc("Load index", 2);
+    res = this->node->Deserialize(binset, *cfg);
+    auto span = rc.ElapseFromBegin("done");
+    span *= 0.001;  // convert to ms
+    knowhere_load_latency.Observe(span);
+#else
+    res = this->node->Deserialize(binset, *cfg);
+#endif
+    return res;
 }
 
 template <typename T>
@@ -198,7 +208,17 @@ Index<T>::DeserializeFromFile(const std::string& filename, const Json& json) {
     if (res != Status::success) {
         return res;
     }
-    return this->node->DeserializeFromFile(filename, *cfg);
+
+#ifdef NOT_COMPILE_FOR_SWIG
+    TimeRecorder rc("Load index from file", 2);
+    res = this->node->DeserializeFromFile(filename, *cfg);
+    auto span = rc.ElapseFromBegin("done");
+    span *= 0.001;  // convert to ms
+    knowhere_load_latency.Observe(span);
+#else
+    res = this->node->DeserializeFromFile(filename, *cfg);
+#endif
+    return res;
 }
 
 template <typename T>
diff --git a/src/common/prometheus_client.cc b/src/common/prometheus_client.cc
index 0475eae82..9486a5336 100644
--- a/src/common/prometheus_client.cc
+++ b/src/common/prometheus_client.cc
@@ -26,6 +26,7 @@ const std::unique_ptr<PrometheusClient> prometheusClient = std::make_unique<Prom
  *   text format parsing error in line 50: expected float as value, got "=\"0.9\"}"
  ******************************************************************************/
 DEFINE_PROMETHEUS_HISTOGRAM(knowhere_build_latency, "index build latency in knowhere (s)")
+DEFINE_PROMETHEUS_HISTOGRAM(knowhere_load_latency, "index load latency in knowhere (ms)")
 DEFINE_PROMETHEUS_HISTOGRAM(knowhere_search_latency, "search latency in knowhere (ms)")
 DEFINE_PROMETHEUS_HISTOGRAM(knowhere_range_search_latency, "range search latency in knowhere (ms)")
 DEFINE_PROMETHEUS_HISTOGRAM(knowhere_ann_iterator_init_latency, "ann iterator init latency in knowhere (ms)")