diff --git a/React/Base/RCTModuleData.mm b/React/Base/RCTModuleData.mm
index 5f49c347a..06d572026 100644
--- a/React/Base/RCTModuleData.mm
+++ b/React/Base/RCTModuleData.mm
@@ -83,7 +83,7 @@ RCT_NOT_IMPLEMENTED(- (instancetype)init);
 
 - (void)setUpInstanceAndBridge
 {
-  RCT_PROFILE_BEGIN_EVENT(RCTProfileTagAlways, @"[RCTModuleData setUpInstanceAndBridge] [_instanceLock lock]", @{ @"moduleClass": _moduleClass });
+  RCT_PROFILE_BEGIN_EVENT(RCTProfileTagAlways, @"[RCTModuleData setUpInstanceAndBridge] [_instanceLock lock]", @{ @"moduleClass": NSStringFromClass(_moduleClass) });
   {
     std::unique_lock<std::mutex> lock(_instanceLock);
 
@@ -92,7 +92,7 @@ RCT_NOT_IMPLEMENTED(- (instancetype)init);
         if (RCT_DEBUG && _requiresMainQueueSetup) {
           RCTAssertMainQueue();
         }
-        RCT_PROFILE_BEGIN_EVENT(RCTProfileTagAlways, @"[RCTModuleData setUpInstanceAndBridge] [_moduleClass new]",  @{ @"moduleClass": _moduleClass });
+        RCT_PROFILE_BEGIN_EVENT(RCTProfileTagAlways, @"[RCTModuleData setUpInstanceAndBridge] [_moduleClass new]",  @{ @"moduleClass": NSStringFromClass(_moduleClass) });
         _instance = [_moduleClass new];
         RCT_PROFILE_END_EVENT(RCTProfileTagAlways, @"", nil);
         if (!_instance) {
@@ -293,8 +293,8 @@ RCT_NOT_IMPLEMENTED(- (instancetype)init);
       self->_constantsToExport = [self->_instance constantsToExport] ?: @{};
     }, YES);
 #pragma clang diagnostic pop
+    RCT_PROFILE_END_EVENT(RCTProfileTagAlways, @"", nil);
   }
-  RCT_PROFILE_END_EVENT(RCTProfileTagAlways, @"", nil);
 }
 
 - (NSArray *)config
diff --git a/ReactCommon/cxxreact/JSCExecutor.cpp b/ReactCommon/cxxreact/JSCExecutor.cpp
index b4cf66d47..05ad4a594 100644
--- a/ReactCommon/cxxreact/JSCExecutor.cpp
+++ b/ReactCommon/cxxreact/JSCExecutor.cpp
@@ -332,6 +332,7 @@ void JSCExecutor::setJSModulesUnbundle(std::unique_ptr<JSModulesUnbundle> unbund
 }
 
 void JSCExecutor::bindBridge() throw(JSException) {
+  SystraceSection s("JSCExecutor::bindBridge");
   auto global = Object::getGlobalObject(m_context);
   auto batchedBridgeValue = global.getProperty("__fbBatchedBridge");
   if (batchedBridgeValue.isUndefined()) {
@@ -345,11 +346,12 @@ void JSCExecutor::bindBridge() throw(JSException) {
 }
 
 void JSCExecutor::callNativeModules(Value&& value) {
+  SystraceSection s("JSCExecutor::callNativeModules");
   try {
     auto calls = value.toJSONString();
     m_delegate->callNativeModules(*this, std::move(calls), true);
   } catch (...) {
-    std::string message = "Error in flush()";
+    std::string message = "Error in callNativeModules()";
     try {
       message += ":" + value.toString().str();
     } catch (...) {
@@ -360,10 +362,12 @@ void JSCExecutor::callNativeModules(Value&& value) {
 }
 
 void JSCExecutor::flush() {
+  SystraceSection s("JSCExecutor::flush");
   callNativeModules(m_flushedQueueJS->callAsFunction({}));
 }
 
 void JSCExecutor::callFunction(const std::string& moduleId, const std::string& methodId, const folly::dynamic& arguments) {
+  SystraceSection s("JSCExecutor::callFunction");
   // This weird pattern is because Value is not default constructible.
   // The lambda is inlined, so there's no overhead.
 
@@ -384,6 +388,7 @@ void JSCExecutor::callFunction(const std::string& moduleId, const std::string& m
 }
 
 void JSCExecutor::invokeCallback(const double callbackId, const folly::dynamic& arguments) {
+  SystraceSection s("JSCExecutor::invokeCallback");
   auto result = [&] {
     try {
       return m_invokeCallbackAndReturnFlushedQueueJS->callAsFunction({
diff --git a/ReactCommon/cxxreact/JSCHelpers.cpp b/ReactCommon/cxxreact/JSCHelpers.cpp
index 194cc4737..366feb39e 100644
--- a/ReactCommon/cxxreact/JSCHelpers.cpp
+++ b/ReactCommon/cxxreact/JSCHelpers.cpp
@@ -6,6 +6,7 @@
 #include <folly/String.h>
 #include <glog/logging.h>
 
+#include "SystraceSection.h"
 #include "Value.h"
 
 namespace facebook {
@@ -41,6 +42,7 @@ String jsStringFromBigString(const JSBigString& bigstr) {
 }
 
 JSValueRef evaluateScript(JSContextRef context, JSStringRef script, JSStringRef source) {
+  SystraceSection s("evaluateScript");
   JSValueRef exn, result;
   result = JSEvaluateScript(context, script, NULL, source, 0, &exn);
   if (result == nullptr) {