diff --git a/atom/browser/lib/rpc-server.coffee b/atom/browser/lib/rpc-server.coffee
index 3eba472570a..d19b5cf0659 100644
--- a/atom/browser/lib/rpc-server.coffee
+++ b/atom/browser/lib/rpc-server.coffee
@@ -4,7 +4,7 @@ objectsRegistry = require './objects-registry.js'
 v8Util = process.atomBinding 'v8_util'
 
 # Convert a real value into meta data.
-valueToMeta = (sender, value) ->
+valueToMeta = (sender, value, optimizeSimpleObject=false) ->
   meta = type: typeof value
 
   meta.type = 'buffer' if Buffer.isBuffer value
@@ -12,6 +12,10 @@ valueToMeta = (sender, value) ->
   meta.type = 'array' if Array.isArray value
   meta.type = 'promise' if value? and value.constructor.name is 'Promise'
 
+  # Treat simple objects as value.
+  if optimizeSimpleObject and meta.type is 'object' and v8Util.getHiddenValue value, 'simple'
+    meta.type = 'value'
+
   # Treat the arguments object as array.
   meta.type = 'array' if meta.type is 'object' and value.callee? and value.length?
 
@@ -80,11 +84,11 @@ unwrapArgs = (sender, args) ->
 callFunction = (event, func, caller, args) ->
   if v8Util.getHiddenValue(func, 'asynchronous') and typeof args[args.length - 1] isnt 'function'
     args.push (ret) ->
-      event.returnValue = valueToMeta event.sender, ret
+      event.returnValue = valueToMeta event.sender, ret, true
     func.apply caller, args
   else
     ret = func.apply caller, args
-    event.returnValue = valueToMeta event.sender, ret
+    event.returnValue = valueToMeta event.sender, ret, true
 
 # Send by BrowserWindow when its render view is deleted.
 process.on 'ATOM_BROWSER_RELEASE_RENDER_VIEW', (id) ->
diff --git a/atom/common/native_mate_converters/gfx_converter.cc b/atom/common/native_mate_converters/gfx_converter.cc
index 6620276b584..37e7aeb3a48 100644
--- a/atom/common/native_mate_converters/gfx_converter.cc
+++ b/atom/common/native_mate_converters/gfx_converter.cc
@@ -14,7 +14,8 @@ namespace mate {
 
 v8::Local<v8::Value> Converter<gfx::Point>::ToV8(v8::Isolate* isolate,
                                                   const gfx::Point& val) {
-  mate::Dictionary dict(isolate, v8::Object::New(isolate));
+  mate::Dictionary dict = mate::Dictionary::CreateEmpty(isolate);
+  dict.SetHidden("simple", true);
   dict.Set("x", val.x());
   dict.Set("y", val.y());
   return dict.GetHandle();
@@ -35,7 +36,8 @@ bool Converter<gfx::Point>::FromV8(v8::Isolate* isolate,
 
 v8::Local<v8::Value> Converter<gfx::Size>::ToV8(v8::Isolate* isolate,
                                                   const gfx::Size& val) {
-  mate::Dictionary dict(isolate, v8::Object::New(isolate));
+  mate::Dictionary dict = mate::Dictionary::CreateEmpty(isolate);
+  dict.SetHidden("simple", true);
   dict.Set("width", val.width());
   dict.Set("height", val.height());
   return dict.GetHandle();
@@ -56,7 +58,8 @@ bool Converter<gfx::Size>::FromV8(v8::Isolate* isolate,
 
 v8::Local<v8::Value> Converter<gfx::Rect>::ToV8(v8::Isolate* isolate,
                                                  const gfx::Rect& val) {
-  mate::Dictionary dict(isolate, v8::Object::New(isolate));
+  mate::Dictionary dict = mate::Dictionary::CreateEmpty(isolate);
+  dict.SetHidden("simple", true);
   dict.Set("x", val.x());
   dict.Set("y", val.y());
   dict.Set("width", val.width());
@@ -95,7 +98,8 @@ struct Converter<gfx::Display::TouchSupport> {
 
 v8::Local<v8::Value> Converter<gfx::Display>::ToV8(v8::Isolate* isolate,
                                                     const gfx::Display& val) {
-  mate::Dictionary dict(isolate, v8::Object::New(isolate));
+  mate::Dictionary dict = mate::Dictionary::CreateEmpty(isolate);
+  dict.SetHidden("simple", true);
   dict.Set("id", val.id());
   dict.Set("bounds", val.bounds());
   dict.Set("workArea", val.work_area());
diff --git a/atom/common/native_mate_converters/v8_value_converter.cc b/atom/common/native_mate_converters/v8_value_converter.cc
index a6358b363ee..a91e614fc6d 100644
--- a/atom/common/native_mate_converters/v8_value_converter.cc
+++ b/atom/common/native_mate_converters/v8_value_converter.cc
@@ -11,6 +11,7 @@
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/values.h"
+#include "native_mate/dictionary.h"
 #include "vendor/node/src/node_buffer.h"
 
 namespace atom {
@@ -179,7 +180,8 @@ v8::Local<v8::Value> V8ValueConverter::ToV8Array(
 
 v8::Local<v8::Value> V8ValueConverter::ToV8Object(
     v8::Isolate* isolate, const base::DictionaryValue* val) const {
-  v8::Local<v8::Object> result(v8::Object::New(isolate));
+  mate::Dictionary result = mate::Dictionary::CreateEmpty(isolate);
+  result.SetHidden("simple", true);
 
   for (base::DictionaryValue::Iterator iter(*val);
        !iter.IsAtEnd(); iter.Advance()) {
@@ -188,17 +190,14 @@ v8::Local<v8::Value> V8ValueConverter::ToV8Object(
     CHECK(!child_v8.IsEmpty());
 
     v8::TryCatch try_catch;
-    result->Set(
-        v8::String::NewFromUtf8(isolate, key.c_str(), v8::String::kNormalString,
-                                key.length()),
-        child_v8);
+    result.Set(key, child_v8);
     if (try_catch.HasCaught()) {
       LOG(ERROR) << "Setter for property " << key.c_str() << " threw an "
                  << "exception.";
     }
   }
 
-  return result;
+  return result.GetHandle();
 }
 
 base::Value* V8ValueConverter::FromV8ValueImpl(
diff --git a/vendor/native_mate b/vendor/native_mate
index b41635e8092..f5e34deb1a5 160000
--- a/vendor/native_mate
+++ b/vendor/native_mate
@@ -1 +1 @@
-Subproject commit b41635e80921bddbf1a36f030490e063cd593477
+Subproject commit f5e34deb1a5226b4e7e620cb65fce0225471d4d9