diff --git a/generator/dawn_json_generator.py b/generator/dawn_json_generator.py
index 60dfbe7..6a89240 100644
--- a/generator/dawn_json_generator.py
+++ b/generator/dawn_json_generator.py
@@ -242,6 +242,21 @@
         # two nextInChain members.
         assert not (self.extensible and self.chained)
 
+    def update_metadata(self):
+        Record.update_metadata(self)
+
+        if self.may_have_dawn_object:
+            self.is_wire_transparent = False
+            return
+
+        assert not (self.chained or self.extensible)
+
+        def get_is_wire_transparent(member):
+            return member.type.is_wire_transparent and member.annotation == 'value'
+
+        self.is_wire_transparent = all(
+            get_is_wire_transparent(m) for m in self.members)
+
     @property
     def output(self):
         return self.chained == "out" or self.extensible == "out"
diff --git a/generator/templates/dawn_wire/WireCmd.cpp b/generator/templates/dawn_wire/WireCmd.cpp
index 0eb1bd1..7bc148f 100644
--- a/generator/templates/dawn_wire/WireCmd.cpp
+++ b/generator/templates/dawn_wire/WireCmd.cpp
@@ -63,9 +63,14 @@
     {%- if member.type.category == "object" -%}
         {%- set Optional = "Optional" if member.optional else "" -%}
         WIRE_TRY(provider.Get{{Optional}}Id({{in}}, &{{out}}));
-    {% elif member.type.category == "structure"%}
-        {%- set Provider = ", provider" if member.type.may_have_dawn_object else "" -%}
-        WIRE_TRY({{as_cType(member.type.name)}}Serialize({{in}}, &{{out}}, buffer{{Provider}}));
+    {%- elif member.type.category == "structure" -%}
+        {%- if member.type.is_wire_transparent -%}
+            static_assert(sizeof({{out}}) == sizeof({{in}}), "Serialize memcpy size must match.");
+            memcpy(&{{out}}, &{{in}}, {{member_transfer_sizeof(member)}});
+        {%- else -%}
+            {%- set Provider = ", provider" if member.type.may_have_dawn_object else "" -%}
+            WIRE_TRY({{as_cType(member.type.name)}}Serialize({{in}}, &{{out}}, buffer{{Provider}}));
+        {%- endif -%}
     {%- else -%}
         {{out}} = {{in}};
     {%- endif -%}
@@ -77,11 +82,16 @@
         {%- set Optional = "Optional" if member.optional else "" -%}
         WIRE_TRY(resolver.Get{{Optional}}FromId({{in}}, &{{out}}));
     {%- elif member.type.category == "structure" -%}
-        WIRE_TRY({{as_cType(member.type.name)}}Deserialize(&{{out}}, &{{in}}, deserializeBuffer, allocator
-            {%- if member.type.may_have_dawn_object -%}
-                , resolver
-            {%- endif -%}
-        ));
+        {%- if member.type.is_wire_transparent -%}
+            static_assert(sizeof({{out}}) == sizeof({{in}}), "Deserialize memcpy size must match.");
+            memcpy(&{{out}}, const_cast<const {{member_transfer_type(member)}}*>(&{{in}}), {{member_transfer_sizeof(member)}});
+        {%- else -%}
+            WIRE_TRY({{as_cType(member.type.name)}}Deserialize(&{{out}}, &{{in}}, deserializeBuffer, allocator
+                {%- if member.type.may_have_dawn_object -%}
+                    , resolver
+                {%- endif -%}
+            ));
+        {%- endif -%}
     {%- else -%}
         static_assert(sizeof({{out}}) >= sizeof({{in}}), "Deserialize assignment may not narrow.");
         {{out}} = {{in}};