diff --git a/src/env-inl.h b/src/env-inl.h
index 084cb9f83c51af..e2da40141d7740 100644
--- a/src/env-inl.h
+++ b/src/env-inl.h
@@ -876,6 +876,16 @@ void Environment::set_process_exit_handler(
 #undef VY
 #undef VP
 
+#define V(PropertyName, TypeName)                                              \
+  inline v8::Local<TypeName> IsolateData::PropertyName() const {               \
+    return PropertyName##_.Get(isolate_);                                      \
+  }                                                                            \
+  inline void IsolateData::set_##PropertyName(v8::Local<TypeName> value) {     \
+    PropertyName##_.Set(isolate_, value);                                      \
+  }
+  PER_ISOLATE_TEMPLATE_PROPERTIES(V)
+#undef V
+
 #define VP(PropertyName, StringValue) V(v8::Private, PropertyName)
 #define VY(PropertyName, StringValue) V(v8::Symbol, PropertyName)
 #define VS(PropertyName, StringValue) V(v8::String, PropertyName)
@@ -891,14 +901,24 @@ void Environment::set_process_exit_handler(
 #undef VY
 #undef VP
 
-#define V(PropertyName, TypeName)                                             \
-  inline v8::Local<TypeName> Environment::PropertyName() const {              \
-    return PersistentToLocal::Strong(PropertyName ## _);                      \
-  }                                                                           \
-  inline void Environment::set_ ## PropertyName(v8::Local<TypeName> value) {  \
-    PropertyName ## _.Reset(isolate(), value);                                \
+#define V(PropertyName, TypeName)                                              \
+  inline v8::Local<TypeName> Environment::PropertyName() const {               \
+    return isolate_data()->PropertyName();                                     \
+  }                                                                            \
+  inline void Environment::set_##PropertyName(v8::Local<TypeName> value) {     \
+    DCHECK(isolate_data()->PropertyName().IsEmpty());                          \
+    isolate_data()->set_##PropertyName(value);                                 \
+  }
+  PER_ISOLATE_TEMPLATE_PROPERTIES(V)
+#undef V
+
+#define V(PropertyName, TypeName)                                              \
+  inline v8::Local<TypeName> Environment::PropertyName() const {               \
+    return PersistentToLocal::Strong(PropertyName##_);                         \
+  }                                                                            \
+  inline void Environment::set_##PropertyName(v8::Local<TypeName> value) {     \
+    PropertyName##_.Reset(isolate(), value);                                   \
   }
-  ENVIRONMENT_STRONG_PERSISTENT_TEMPLATES(V)
   ENVIRONMENT_STRONG_PERSISTENT_VALUES(V)
 #undef V
 
diff --git a/src/env.cc b/src/env.cc
index b4f22a4ee43e22..0a6140aa2157e3 100644
--- a/src/env.cc
+++ b/src/env.cc
@@ -238,9 +238,43 @@ AsyncHooks::DefaultTriggerAsyncIdScope::DefaultTriggerAsyncIdScope(
     : DefaultTriggerAsyncIdScope(async_wrap->env(),
                                  async_wrap->get_async_id()) {}
 
-std::vector<size_t> IsolateData::Serialize(SnapshotCreator* creator) {
+std::ostream& operator<<(std::ostream& output,
+                         const std::vector<SnapshotIndex>& v) {
+  output << "{ ";
+  for (const SnapshotIndex i : v) {
+    output << i << ", ";
+  }
+  output << " }";
+  return output;
+}
+
+std::ostream& operator<<(std::ostream& output,
+                         const std::vector<PropInfo>& vec) {
+  output << "{\n";
+  for (const auto& info : vec) {
+    output << "  { \"" << info.name << "\", " << std::to_string(info.id) << ", "
+           << std::to_string(info.index) << " },\n";
+  }
+  output << "}";
+  return output;
+}
+
+std::ostream& operator<<(std::ostream& output,
+                         const IsolateDataSerializeInfo& i) {
+  output << "{\n"
+         << "// -- primitive begins --\n"
+         << i.primitive_values << ",\n"
+         << "// -- primitive ends --\n"
+         << "// -- template_values begins --\n"
+         << i.template_values << ",\n"
+         << "// -- template_values ends --\n"
+         << "}";
+  return output;
+}
+
+IsolateDataSerializeInfo IsolateData::Serialize(SnapshotCreator* creator) {
   Isolate* isolate = creator->GetIsolate();
-  std::vector<size_t> indexes;
+  IsolateDataSerializeInfo info;
   HandleScope handle_scope(isolate);
   // XXX(joyeecheung): technically speaking, the indexes here should be
   // consecutive and we could just return a range instead of an array,
@@ -251,7 +285,8 @@ std::vector<size_t> IsolateData::Serialize(SnapshotCreator* creator) {
 #define VY(PropertyName, StringValue) V(Symbol, PropertyName)
 #define VS(PropertyName, StringValue) V(String, PropertyName)
 #define V(TypeName, PropertyName)                                              \
-  indexes.push_back(creator->AddData(PropertyName##_.Get(isolate)));
+  info.primitive_values.push_back(                                             \
+      creator->AddData(PropertyName##_.Get(isolate)));
   PER_ISOLATE_PRIVATE_SYMBOL_PROPERTIES(VP)
   PER_ISOLATE_SYMBOL_PROPERTIES(VY)
   PER_ISOLATE_STRING_PROPERTIES(VS)
@@ -259,13 +294,27 @@ std::vector<size_t> IsolateData::Serialize(SnapshotCreator* creator) {
 #undef VY
 #undef VS
 #undef VP
+
   for (size_t i = 0; i < AsyncWrap::PROVIDERS_LENGTH; i++)
-    indexes.push_back(creator->AddData(async_wrap_provider(i)));
+    info.primitive_values.push_back(creator->AddData(async_wrap_provider(i)));
+
+  size_t id = 0;
+#define V(PropertyName, TypeName)                                              \
+  do {                                                                         \
+    Local<TypeName> field = PropertyName();                                    \
+    if (!field.IsEmpty()) {                                                    \
+      size_t index = creator->AddData(field);                                  \
+      info.template_values.push_back({#PropertyName, id, index});              \
+    }                                                                          \
+    id++;                                                                      \
+  } while (0);
+  PER_ISOLATE_TEMPLATE_PROPERTIES(V)
+#undef V
 
-  return indexes;
+  return info;
 }
 
-void IsolateData::DeserializeProperties(const std::vector<size_t>* indexes) {
+void IsolateData::DeserializeProperties(const IsolateDataSerializeInfo* info) {
   size_t i = 0;
   HandleScope handle_scope(isolate_);
 
@@ -275,7 +324,8 @@ void IsolateData::DeserializeProperties(const std::vector<size_t>* indexes) {
 #define V(TypeName, PropertyName)                                              \
   do {                                                                         \
     MaybeLocal<TypeName> maybe_field =                                         \
-        isolate_->GetDataFromSnapshotOnce<TypeName>((*indexes)[i++]);          \
+        isolate_->GetDataFromSnapshotOnce<TypeName>(                           \
+            info->primitive_values[i++]);                                      \
     Local<TypeName> field;                                                     \
     if (!maybe_field.ToLocal(&field)) {                                        \
       fprintf(stderr, "Failed to deserialize " #PropertyName "\n");            \
@@ -292,13 +342,38 @@ void IsolateData::DeserializeProperties(const std::vector<size_t>* indexes) {
 
   for (size_t j = 0; j < AsyncWrap::PROVIDERS_LENGTH; j++) {
     MaybeLocal<String> maybe_field =
-        isolate_->GetDataFromSnapshotOnce<String>((*indexes)[i++]);
+        isolate_->GetDataFromSnapshotOnce<String>(info->primitive_values[i++]);
     Local<String> field;
     if (!maybe_field.ToLocal(&field)) {
       fprintf(stderr, "Failed to deserialize AsyncWrap provider %zu\n", j);
     }
     async_wrap_providers_[j].Set(isolate_, field);
   }
+
+  const std::vector<PropInfo>& values = info->template_values;
+  i = 0;  // index to the array
+  size_t id = 0;
+#define V(PropertyName, TypeName)                                              \
+  do {                                                                         \
+    if (values.size() > i && id == values[i].id) {                             \
+      const PropInfo& d = values[i];                                           \
+      DCHECK_EQ(d.name, #PropertyName);                                        \
+      MaybeLocal<TypeName> maybe_field =                                       \
+          isolate_->GetDataFromSnapshotOnce<TypeName>(d.index);                \
+      Local<TypeName> field;                                                   \
+      if (!maybe_field.ToLocal(&field)) {                                      \
+        fprintf(stderr,                                                        \
+                "Failed to deserialize isolate data template " #PropertyName   \
+                "\n");                                                         \
+      }                                                                        \
+      set_##PropertyName(field);                                               \
+      i++;                                                                     \
+    }                                                                          \
+    id++;                                                                      \
+  } while (0);
+
+  PER_ISOLATE_TEMPLATE_PROPERTIES(V);
+#undef V
 }
 
 void IsolateData::CreateProperties() {
@@ -363,13 +438,15 @@ void IsolateData::CreateProperties() {
         sizeof(#Provider) - 1).ToLocalChecked());
   NODE_ASYNC_PROVIDER_TYPES(V)
 #undef V
+
+  // TODO(legendecas): eagerly create per isolate templates.
 }
 
 IsolateData::IsolateData(Isolate* isolate,
                          uv_loop_t* event_loop,
                          MultiIsolatePlatform* platform,
                          ArrayBufferAllocator* node_allocator,
-                         const std::vector<size_t>* indexes)
+                         const IsolateDataSerializeInfo* isolate_data_info)
     : isolate_(isolate),
       event_loop_(event_loop),
       node_allocator_(node_allocator == nullptr ? nullptr
@@ -378,10 +455,10 @@ IsolateData::IsolateData(Isolate* isolate,
   options_.reset(
       new PerIsolateOptions(*(per_process::cli_options->per_isolate)));
 
-  if (indexes == nullptr) {
+  if (isolate_data_info == nullptr) {
     CreateProperties();
   } else {
-    DeserializeProperties(indexes);
+    DeserializeProperties(isolate_data_info);
   }
 }
 
@@ -1527,16 +1604,6 @@ void AsyncHooks::Deserialize(Local<Context> context) {
   info_ = nullptr;
 }
 
-std::ostream& operator<<(std::ostream& output,
-                         const std::vector<SnapshotIndex>& v) {
-  output << "{ ";
-  for (const SnapshotIndex i : v) {
-    output << i << ", ";
-  }
-  output << " }";
-  return output;
-}
-
 std::ostream& operator<<(std::ostream& output,
                          const AsyncHooks::SerializeInfo& i) {
   output << "{\n"
@@ -1748,19 +1815,6 @@ EnvSerializeInfo Environment::Serialize(SnapshotCreator* creator) {
       should_abort_on_uncaught_toggle_.Serialize(ctx, creator);
 
   size_t id = 0;
-#define V(PropertyName, TypeName)                                              \
-  do {                                                                         \
-    Local<TypeName> field = PropertyName();                                    \
-    if (!field.IsEmpty()) {                                                    \
-      size_t index = creator->AddData(field);                                  \
-      info.persistent_templates.push_back({#PropertyName, id, index});         \
-    }                                                                          \
-    id++;                                                                      \
-  } while (0);
-  ENVIRONMENT_STRONG_PERSISTENT_TEMPLATES(V)
-#undef V
-
-  id = 0;
 #define V(PropertyName, TypeName)                                              \
   do {                                                                         \
     Local<TypeName> field = PropertyName();                                    \
@@ -1777,17 +1831,6 @@ EnvSerializeInfo Environment::Serialize(SnapshotCreator* creator) {
   return info;
 }
 
-std::ostream& operator<<(std::ostream& output,
-                         const std::vector<PropInfo>& vec) {
-  output << "{\n";
-  for (const auto& info : vec) {
-    output << "  { \"" << info.name << "\", " << std::to_string(info.id) << ", "
-           << std::to_string(info.index) << " },\n";
-  }
-  output << "}";
-  return output;
-}
-
 std::ostream& operator<<(std::ostream& output,
                          const std::vector<std::string>& vec) {
   output << "{\n";
@@ -1817,9 +1860,6 @@ std::ostream& operator<<(std::ostream& output, const EnvSerializeInfo& i) {
          << i.stream_base_state << ",  // stream_base_state\n"
          << i.should_abort_on_uncaught_toggle
          << ",  // should_abort_on_uncaught_toggle\n"
-         << "// -- persistent_templates begins --\n"
-         << i.persistent_templates << ",\n"
-         << "// persistent_templates ends --\n"
          << "// -- persistent_values begins --\n"
          << i.persistent_values << ",\n"
          << "// -- persistent_values ends --\n"
@@ -1868,40 +1908,30 @@ void Environment::DeserializeProperties(const EnvSerializeInfo* info) {
     std::cerr << *info << "\n";
   }
 
-  const std::vector<PropInfo>& templates = info->persistent_templates;
+  const std::vector<PropInfo>& values = info->persistent_values;
   size_t i = 0;  // index to the array
   size_t id = 0;
-#define SetProperty(PropertyName, TypeName, vector, type, from)                \
+#define V(PropertyName, TypeName)                                              \
   do {                                                                         \
-    if (vector.size() > i && id == vector[i].id) {                             \
-      const PropInfo& d = vector[i];                                           \
+    if (values.size() > i && id == values[i].id) {                             \
+      const PropInfo& d = values[i];                                           \
       DCHECK_EQ(d.name, #PropertyName);                                        \
       MaybeLocal<TypeName> maybe_field =                                       \
-          from->GetDataFromSnapshotOnce<TypeName>(d.index);                    \
+          ctx->GetDataFromSnapshotOnce<TypeName>(d.index);                     \
       Local<TypeName> field;                                                   \
       if (!maybe_field.ToLocal(&field)) {                                      \
         fprintf(stderr,                                                        \
-                "Failed to deserialize environment " #type " " #PropertyName   \
+                "Failed to deserialize environment value " #PropertyName       \
                 "\n");                                                         \
       }                                                                        \
       set_##PropertyName(field);                                               \
       i++;                                                                     \
     }                                                                          \
-  } while (0);                                                                 \
-  id++;
-#define V(PropertyName, TypeName) SetProperty(PropertyName, TypeName,          \
-                                              templates, template, isolate_)
-  ENVIRONMENT_STRONG_PERSISTENT_TEMPLATES(V);
-#undef V
+    id++;                                                                      \
+  } while (0);
 
-  i = 0;  // index to the array
-  id = 0;
-  const std::vector<PropInfo>& values = info->persistent_values;
-#define V(PropertyName, TypeName) SetProperty(PropertyName, TypeName,          \
-                                              values, value, ctx)
   ENVIRONMENT_STRONG_PERSISTENT_VALUES(V);
 #undef V
-#undef SetProperty
 
   MaybeLocal<Context> maybe_ctx_from_snapshot =
       ctx->GetDataFromSnapshotOnce<Context>(info->context);
diff --git a/src/env.h b/src/env.h
index 86d88e67274c2c..d38bc5338bc3e8 100644
--- a/src/env.h
+++ b/src/env.h
@@ -469,7 +469,7 @@ class NoArrayBufferZeroFillScope {
   V(x_forwarded_string, "x-forwarded-for")                                     \
   V(zero_return_string, "ZERO_RETURN")
 
-#define ENVIRONMENT_STRONG_PERSISTENT_TEMPLATES(V)                             \
+#define PER_ISOLATE_TEMPLATE_PROPERTIES(V)                                     \
   V(async_wrap_ctor_template, v8::FunctionTemplate)                            \
   V(async_wrap_object_ctor_template, v8::FunctionTemplate)                     \
   V(base_object_ctor_template, v8::FunctionTemplate)                           \
@@ -575,17 +575,32 @@ class NoArrayBufferZeroFillScope {
 class Environment;
 
 typedef size_t SnapshotIndex;
+
+struct PropInfo {
+  std::string name;     // name for debugging
+  size_t id;            // In the list - in case there are any empty entries
+  SnapshotIndex index;  // In the snapshot
+};
+
+struct IsolateDataSerializeInfo {
+  std::vector<SnapshotIndex> primitive_values;
+  std::vector<PropInfo> template_values;
+
+  friend std::ostream& operator<<(std::ostream& o,
+                                  const IsolateDataSerializeInfo& i);
+};
+
 class NODE_EXTERN_PRIVATE IsolateData : public MemoryRetainer {
  public:
   IsolateData(v8::Isolate* isolate,
               uv_loop_t* event_loop,
               MultiIsolatePlatform* platform = nullptr,
               ArrayBufferAllocator* node_allocator = nullptr,
-              const std::vector<size_t>* indexes = nullptr);
+              const IsolateDataSerializeInfo* isolate_data_info = nullptr);
   SET_MEMORY_INFO_NAME(IsolateData)
   SET_SELF_SIZE(IsolateData)
   void MemoryInfo(MemoryTracker* tracker) const override;
-  std::vector<size_t> Serialize(v8::SnapshotCreator* creator);
+  IsolateDataSerializeInfo Serialize(v8::SnapshotCreator* creator);
 
   inline uv_loop_t* event_loop() const;
   inline MultiIsolatePlatform* platform() const;
@@ -609,6 +624,13 @@ class NODE_EXTERN_PRIVATE IsolateData : public MemoryRetainer {
 #undef VY
 #undef VS
 #undef VP
+
+#define V(PropertyName, TypeName)                                              \
+  inline v8::Local<TypeName> PropertyName() const;                             \
+  inline void set_##PropertyName(v8::Local<TypeName> value);
+  PER_ISOLATE_TEMPLATE_PROPERTIES(V)
+#undef V
+
   inline v8::Local<v8::String> async_wrap_provider(int index) const;
 
   size_t max_young_gen_size = 1;
@@ -621,20 +643,24 @@ class NODE_EXTERN_PRIVATE IsolateData : public MemoryRetainer {
   IsolateData& operator=(IsolateData&&) = delete;
 
  private:
-  void DeserializeProperties(const std::vector<size_t>* indexes);
+  void DeserializeProperties(const IsolateDataSerializeInfo* isolate_data_info);
   void CreateProperties();
 
 #define VP(PropertyName, StringValue) V(v8::Private, PropertyName)
 #define VY(PropertyName, StringValue) V(v8::Symbol, PropertyName)
 #define VS(PropertyName, StringValue) V(v8::String, PropertyName)
+#define VT(PropertyName, TypeName) V(TypeName, PropertyName)
 #define V(TypeName, PropertyName)                                             \
   v8::Eternal<TypeName> PropertyName ## _;
   PER_ISOLATE_PRIVATE_SYMBOL_PROPERTIES(VP)
   PER_ISOLATE_SYMBOL_PROPERTIES(VY)
   PER_ISOLATE_STRING_PROPERTIES(VS)
+  PER_ISOLATE_TEMPLATE_PROPERTIES(VT)
 #undef V
-#undef VY
+#undef V
+#undef VT
 #undef VS
+#undef VY
 #undef VP
   // Keep a list of all Persistent strings used for AsyncWrap Provider types.
   std::array<v8::Eternal<v8::String>, AsyncWrap::PROVIDERS_LENGTH>
@@ -925,12 +951,6 @@ class CleanupHookCallback {
   uint64_t insertion_order_counter_;
 };
 
-struct PropInfo {
-  std::string name;     // name for debugging
-  size_t id;            // In the list - in case there are any empty entries
-  SnapshotIndex index;  // In the snapshot
-};
-
 typedef void (*DeserializeRequestCallback)(v8::Local<v8::Context> context,
                                            v8::Local<v8::Object> holder,
                                            int index,
@@ -955,7 +975,6 @@ struct EnvSerializeInfo {
   AliasedBufferIndex stream_base_state;
   AliasedBufferIndex should_abort_on_uncaught_toggle;
 
-  std::vector<PropInfo> persistent_templates;
   std::vector<PropInfo> persistent_values;
 
   SnapshotIndex context;
@@ -974,7 +993,7 @@ struct SnapshotData {
   // building process.
   v8::StartupData v8_snapshot_blob_data{nullptr, 0};
 
-  std::vector<size_t> isolate_data_indices;
+  IsolateDataSerializeInfo isolate_data_info;
   // TODO(joyeecheung): there should be a vector of env_info once we snapshot
   // the worker environments.
   EnvSerializeInfo env_info;
@@ -1342,8 +1361,8 @@ class Environment : public MemoryRetainer {
 #define V(PropertyName, TypeName)                                             \
   inline v8::Local<TypeName> PropertyName() const;                            \
   inline void set_ ## PropertyName(v8::Local<TypeName> value);
+  PER_ISOLATE_TEMPLATE_PROPERTIES(V)
   ENVIRONMENT_STRONG_PERSISTENT_VALUES(V)
-  ENVIRONMENT_STRONG_PERSISTENT_TEMPLATES(V)
 #undef V
 
   inline v8::Local<v8::Context> context() const;
@@ -1636,7 +1655,6 @@ class Environment : public MemoryRetainer {
 
 #define V(PropertyName, TypeName) v8::Global<TypeName> PropertyName ## _;
   ENVIRONMENT_STRONG_PERSISTENT_VALUES(V)
-  ENVIRONMENT_STRONG_PERSISTENT_TEMPLATES(V)
 #undef V
 
   v8::Global<v8::Context> context_;
diff --git a/src/node_main_instance.cc b/src/node_main_instance.cc
index 7e89cfc51f5e4b..1287e795de5bbc 100644
--- a/src/node_main_instance.cc
+++ b/src/node_main_instance.cc
@@ -89,8 +89,7 @@ NodeMainInstance::NodeMainInstance(const SnapshotData* snapshot_data,
       event_loop,
       platform,
       array_buffer_allocator_.get(),
-      snapshot_data == nullptr ? nullptr
-                               : &(snapshot_data->isolate_data_indices));
+      snapshot_data == nullptr ? nullptr : &(snapshot_data->isolate_data_info));
   IsolateSettings s;
   SetIsolateMiscHandlers(isolate_, s);
   if (snapshot_data == nullptr) {
diff --git a/src/node_snapshotable.cc b/src/node_snapshotable.cc
index 27a26bb07954d8..9e88c2157d272c 100644
--- a/src/node_snapshotable.cc
+++ b/src/node_snapshotable.cc
@@ -126,13 +126,10 @@ static const int v8_snapshot_blob_size = )"
   { v8_snapshot_blob_data, v8_snapshot_blob_size },
   // -- v8_snapshot_blob_data ends --
   // -- isolate_data_indices begins --
-  {
-)";
-  WriteVector(&ss,
-              data->isolate_data_indices.data(),
-              data->isolate_data_indices.size());
-  ss << R"(},
+)" << data->isolate_data_info
+     << R"(
   // -- isolate_data_indices ends --
+  ,
   // -- env_info begins --
 )" << data->env_info
      << R"(
@@ -222,9 +219,6 @@ int SnapshotBuilder::Generate(SnapshotData* out,
       }
     });
 
-    out->isolate_data_indices =
-        main_instance->isolate_data()->Serialize(&creator);
-
     // The default context with only things created by V8.
     Local<Context> default_context = Context::New(isolate);
 
@@ -285,6 +279,8 @@ int SnapshotBuilder::Generate(SnapshotData* out,
       }
 
       // Serialize the native states
+      out->isolate_data_info =
+          main_instance->isolate_data()->Serialize(&creator);
       out->env_info = env->Serialize(&creator);
 
 #ifdef NODE_USE_NODE_CODE_CACHE