diff --git a/src/query.cc b/src/query.cc
index 9689cc48..6b4d4b63 100644
--- a/src/query.cc
+++ b/src/query.cc
@@ -791,19 +791,19 @@ void QueryDatabase::ApplyIndexUpdate(IndexUpdate* update) {
   ImportOrUpdate(update->files_def_update);
 
   RemoveUsrs(SymbolKind::Type, update->types_removed);
-  ImportOrUpdate(update->types_def_update);
+  ImportOrUpdate(std::move(update->types_def_update));
   HANDLE_MERGEABLE(types_derived, derived, types);
   HANDLE_MERGEABLE(types_instances, instances, types);
   HANDLE_MERGEABLE(types_uses, uses, types);
 
   RemoveUsrs(SymbolKind::Func, update->funcs_removed);
-  ImportOrUpdate(update->funcs_def_update);
+  ImportOrUpdate(std::move(update->funcs_def_update));
   HANDLE_MERGEABLE(funcs_declarations, declarations, funcs);
   HANDLE_MERGEABLE(funcs_derived, derived, funcs);
   HANDLE_MERGEABLE(funcs_callers, callers, funcs);
 
   RemoveUsrs(SymbolKind::Var, update->vars_removed);
-  ImportOrUpdate(update->vars_def_update);
+  ImportOrUpdate(std::move(update->vars_def_update));
   HANDLE_MERGEABLE(vars_declarations, declarations, vars);
   HANDLE_MERGEABLE(vars_uses, uses, vars);
 
@@ -827,7 +827,7 @@ void QueryDatabase::ImportOrUpdate(
 }
 
 void QueryDatabase::ImportOrUpdate(
-    const std::vector<QueryType::DefUpdate>& updates) {
+    std::vector<QueryType::DefUpdate>&& updates) {
   // This function runs on the querydb thread.
 
   for (auto& def : updates) {
@@ -842,7 +842,7 @@ void QueryDatabase::ImportOrUpdate(
     // Keep the existing definition if it is higher quality.
     if (!(existing.def && existing.def->definition_spelling &&
           !def.value.definition_spelling)) {
-      existing.def = def.value;
+      existing.def = std::move(def.value);
       UpdateSymbols(&existing.symbol_idx, SymbolKind::Type,
                     it->second.id);
     }
@@ -850,7 +850,7 @@ void QueryDatabase::ImportOrUpdate(
 }
 
 void QueryDatabase::ImportOrUpdate(
-    const std::vector<QueryFunc::DefUpdate>& updates) {
+    std::vector<QueryFunc::DefUpdate>&& updates) {
   // This function runs on the querydb thread.
 
   for (auto& def : updates) {
@@ -865,15 +865,14 @@ void QueryDatabase::ImportOrUpdate(
     // Keep the existing definition if it is higher quality.
     if (!(existing.def && existing.def->definition_spelling &&
           !def.value.definition_spelling)) {
-      existing.def = def.value;
+      existing.def = std::move(def.value);
       UpdateSymbols(&existing.symbol_idx, SymbolKind::Func,
                     it->second.id);
     }
   }
 }
 
-void QueryDatabase::ImportOrUpdate(
-    const std::vector<QueryVar::DefUpdate>& updates) {
+void QueryDatabase::ImportOrUpdate(std::vector<QueryVar::DefUpdate>&& updates) {
   // This function runs on the querydb thread.
 
   for (auto& def : updates) {
@@ -888,7 +887,7 @@ void QueryDatabase::ImportOrUpdate(
     // Keep the existing definition if it is higher quality.
     if (!(existing.def && existing.def->definition_spelling &&
           !def.value.definition_spelling)) {
-      existing.def = def.value;
+      existing.def = std::move(def.value);
       if (!def.value.is_local())
         UpdateSymbols(&existing.symbol_idx, SymbolKind::Var,
                       it->second.id);
diff --git a/src/query.h b/src/query.h
index 9c205307..9119a9d1 100644
--- a/src/query.h
+++ b/src/query.h
@@ -409,9 +409,9 @@ struct QueryDatabase {
   // Insert the contents of |update| into |db|.
   void ApplyIndexUpdate(IndexUpdate* update);
   void ImportOrUpdate(const std::vector<QueryFile::DefUpdate>& updates);
-  void ImportOrUpdate(const std::vector<QueryType::DefUpdate>& updates);
-  void ImportOrUpdate(const std::vector<QueryFunc::DefUpdate>& updates);
-  void ImportOrUpdate(const std::vector<QueryVar::DefUpdate>& updates);
+  void ImportOrUpdate(std::vector<QueryType::DefUpdate>&& updates);
+  void ImportOrUpdate(std::vector<QueryFunc::DefUpdate>&& updates);
+  void ImportOrUpdate(std::vector<QueryVar::DefUpdate>&& updates);
   void UpdateSymbols(Maybe<Id<void>>* symbol_idx, SymbolKind kind, RawId idx);
   std::string_view GetSymbolDetailedName(RawId symbol_idx) const;
   std::string_view GetSymbolShortName(RawId symbol_idx) const;
diff --git a/src/query_utils.cc b/src/query_utils.cc
index 5762bef2..202a0bf9 100644
--- a/src/query_utils.cc
+++ b/src/query_utils.cc
@@ -3,6 +3,7 @@
 #include "queue_manager.h"
 
 #include <climits>
+#include <queue>
 
 namespace {
 
diff --git a/src/utils.cc b/src/utils.cc
index 7501601d..726eba11 100644
--- a/src/utils.cc
+++ b/src/utils.cc
@@ -13,8 +13,7 @@
 #include <cstring>
 #include <fstream>
 #include <functional>
-#include <iostream>
-#include <locale>
+#include <queue>
 #include <sstream>
 #include <string>
 #include <unordered_map>
diff --git a/src/utils.h b/src/utils.h
index a7fca9f0..5b985ba6 100644
--- a/src/utils.h
+++ b/src/utils.h
@@ -5,7 +5,7 @@
 #include <algorithm>
 #include <functional>
 #include <memory>
-#include <queue>
+#include <iterator>
 #include <string>
 #include <unordered_map>
 #include <vector>
@@ -137,14 +137,8 @@ void AddRange(std::vector<T>* dest, const std::vector<T>& to_add) {
 
 template <typename T>
 void AddRange(std::vector<T>* dest, std::vector<T>&& to_add) {
-  for (T& x : to_add)
-    dest->push_back(std::move(x));
-}
-
-template <typename T>
-void PushRange(std::queue<T>* dest, const std::vector<T>& to_add) {
-  for (const T& e : to_add)
-    dest->push(e);
+  dest->push_back(dest->end(), std::make_move_iterator(to_add.begin()),
+                  std::make_move_iterator(to_add.end()));
 }
 
 template <typename T>