diff --git a/core/variant/dictionary.cpp b/core/variant/dictionary.cpp
index c0d5be5a4fe..b2a7de782ae 100644
--- a/core/variant/dictionary.cpp
+++ b/core/variant/dictionary.cpp
@@ -305,6 +305,12 @@ void Dictionary::_ref(const Dictionary &p_from) const {
 	_p = p_from._p;
 }
 
+void Dictionary::reserve(int p_new_capacity) {
+	ERR_FAIL_COND_MSG(_p->read_only, "Dictionary is in read-only state.");
+	ERR_FAIL_COND_MSG(p_new_capacity < 0, "New capacity must be non-negative.");
+	_p->variant_map.reserve(p_new_capacity);
+}
+
 void Dictionary::clear() {
 	ERR_FAIL_COND_MSG(_p->read_only, "Dictionary is in read-only state.");
 	_p->variant_map.clear();
@@ -613,6 +619,7 @@ Dictionary Dictionary::recursive_duplicate(bool p_deep, ResourceDeepDuplicateMod
 		return n;
 	}
 
+	n.reserve(_p->variant_map.size());
 	if (p_deep) {
 		bool is_call_chain_end = recursion_count == 0;
 
diff --git a/core/variant/dictionary.h b/core/variant/dictionary.h
index 01f8bd894d9..e70dadbac29 100644
--- a/core/variant/dictionary.h
+++ b/core/variant/dictionary.h
@@ -72,6 +72,7 @@ public:
 
 	int size() const;
 	bool is_empty() const;
+	void reserve(int p_new_capacity);
 	void clear();
 	void sort();
 	void merge(const Dictionary &p_dictionary, bool p_overwrite = false);
diff --git a/modules/gdscript/gdscript_vm.cpp b/modules/gdscript/gdscript_vm.cpp
index fd11af93c77..983ccd7ddb1 100644
--- a/modules/gdscript/gdscript_vm.cpp
+++ b/modules/gdscript/gdscript_vm.cpp
@@ -1829,7 +1829,7 @@ Variant GDScriptFunction::call(GDScriptInstance *p_instance, const Variant **p_a
 
 				int argc = _code_ptr[ip + 1];
 				Dictionary dict;
-
+				dict.reserve(argc);
 				for (int i = 0; i < argc; i++) {
 					GET_INSTRUCTION_ARG(k, i * 2 + 0);
 					GET_INSTRUCTION_ARG(v, i * 2 + 1);
@@ -1867,7 +1867,7 @@ Variant GDScriptFunction::call(GDScriptInstance *p_instance, const Variant **p_a
 
 				Dictionary dict;
 				dict.set_typed(key_builtin_type, key_native_type, *key_script_type, value_builtin_type, value_native_type, *value_script_type);
-
+				dict.reserve(argc);
 				for (int i = 0; i < argc; i++) {
 					GET_INSTRUCTION_ARG(k, i * 2 + 0);
 					GET_INSTRUCTION_ARG(v, i * 2 + 1);