diff --git a/CHANGELOG.md b/CHANGELOG.md
index e42c8667..13b23546 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -25,6 +25,10 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 	- all rules initialize `Type` lazily (performance optimization)
 - `ArrayOfRule`
 	- check during metadata parsing that default value is an array when `mergeDefaults` is enabled
+- `FieldContext`, `MappedObjectContext`
+	- initializes `Type` lazily (performance optimization)
+- `ArrayShapeType`
+	- `getFields()` always returns the same instances
 
 ## [0.2.0](https://github.com/orisai/object-mapper/compare/0.1.0...0.2.0) - 2024-06-22
 
diff --git a/src/Context/FieldContext.php b/src/Context/FieldContext.php
index 1c39f035..974ab99e 100644
--- a/src/Context/FieldContext.php
+++ b/src/Context/FieldContext.php
@@ -2,6 +2,7 @@
 
 namespace Orisai\ObjectMapper\Context;
 
+use Closure;
 use Orisai\ObjectMapper\Meta\MetaLoader;
 use Orisai\ObjectMapper\Meta\Shared\DefaultValueMeta;
 use Orisai\ObjectMapper\Processing\Options;
@@ -13,7 +14,10 @@
 final class FieldContext extends BaseFieldContext
 {
 
-	private Type $type;
+	/** @var Closure(): Type */
+	private Closure $typeCreator;
+
+	private ?Type $type = null;
 
 	private DefaultValueMeta $default;
 
@@ -23,6 +27,7 @@ final class FieldContext extends BaseFieldContext
 	private ReflectionProperty $property;
 
 	/**
+	 * @param Closure(): Type $typeCreator
 	 * @param int|string $fieldName
 	 */
 	public function __construct(
@@ -30,7 +35,7 @@ public function __construct(
 		RuleManager $ruleManager,
 		Processor $processor,
 		Options $options,
-		Type $type,
+		Closure $typeCreator,
 		DefaultValueMeta $default,
 		bool $initializeObjects,
 		$fieldName,
@@ -38,7 +43,7 @@ public function __construct(
 	)
 	{
 		parent::__construct($metaLoader, $ruleManager, $processor, $options, $initializeObjects);
-		$this->type = $type;
+		$this->typeCreator = $typeCreator;
 		$this->default = $default;
 		$this->fieldName = $fieldName;
 		$this->property = $property;
@@ -46,7 +51,14 @@ public function __construct(
 
 	public function getType(): Type
 	{
-		return $this->type;
+		if ($this->type !== null) {
+			return $this->type;
+		}
+
+		$type = ($this->typeCreator)();
+		unset($this->typeCreator);
+
+		return $this->type = $type;
 	}
 
 	public function hasDefaultValue(): bool
diff --git a/src/Context/MappedObjectContext.php b/src/Context/MappedObjectContext.php
index 903b6698..eb88e54e 100644
--- a/src/Context/MappedObjectContext.php
+++ b/src/Context/MappedObjectContext.php
@@ -2,6 +2,7 @@
 
 namespace Orisai\ObjectMapper\Context;
 
+use Closure;
 use Orisai\ObjectMapper\Meta\MetaLoader;
 use Orisai\ObjectMapper\Processing\Options;
 use Orisai\ObjectMapper\Processing\Processor;
@@ -11,24 +12,37 @@
 final class MappedObjectContext extends BaseFieldContext
 {
 
-	private MappedObjectType $type;
+	/** @var Closure(): MappedObjectType */
+	private Closure $typeCreator;
 
+	private ?MappedObjectType $type = null;
+
+	/**
+	 * @param Closure(): MappedObjectType $typeCreator
+	 */
 	public function __construct(
 		MetaLoader $metaLoader,
 		RuleManager $ruleManager,
 		Processor $processor,
 		Options $options,
-		MappedObjectType $type,
+		Closure $typeCreator,
 		bool $initializeObjects
 	)
 	{
 		parent::__construct($metaLoader, $ruleManager, $processor, $options, $initializeObjects);
-		$this->type = $type;
+		$this->typeCreator = $typeCreator;
 	}
 
 	public function getType(): MappedObjectType
 	{
-		return $this->type;
+		if ($this->type !== null) {
+			return $this->type;
+		}
+
+		$type = ($this->typeCreator)();
+		unset($this->typeCreator);
+
+		return $this->type = $type;
 	}
 
 }
diff --git a/src/Processing/DefaultProcessor.php b/src/Processing/DefaultProcessor.php
index 8bf7c6df..9a4d686b 100644
--- a/src/Processing/DefaultProcessor.php
+++ b/src/Processing/DefaultProcessor.php
@@ -2,6 +2,7 @@
 
 namespace Orisai\ObjectMapper\Processing;
 
+use Closure;
 use Nette\Utils\Helpers;
 use Orisai\Exceptions\Logic\InvalidState;
 use Orisai\ObjectMapper\Args\Args;
@@ -29,6 +30,7 @@
 use Orisai\ObjectMapper\Rules\RuleManager;
 use Orisai\ObjectMapper\Types\MappedObjectType;
 use Orisai\ObjectMapper\Types\MessageType;
+use Orisai\ObjectMapper\Types\Type;
 use ReflectionProperty;
 use function array_diff;
 use function array_key_exists;
@@ -109,11 +111,11 @@ private function processBase($data, string $class, ?Options $options, bool $init
 	{
 		$options ??= new Options();
 		$options = $options->withProcessedClass($class);
-		$type = $this->createMappedObjectType($class, $options);
+		$typeCreator = fn (): MappedObjectType => $this->createMappedObjectType($class, $options);
 		$meta = $this->metaCache[$class] ??= $this->metaLoader->load($class);
 		$holder = $this->createHolder($class, $meta->getClass());
 
-		$mappedObjectContext = $this->createMappedObjectContext($options, $type, $initializeObjects);
+		$mappedObjectContext = $this->createMappedObjectContext($options, $typeCreator, $initializeObjects);
 		$callContext = $this->createProcessorRunContext($class, $meta, $holder);
 
 		$processedData = $this->processData($data, $mappedObjectContext, $callContext);
@@ -181,9 +183,12 @@ private function createMappedObjectType(string $class, Options $options): Mapped
 		);
 	}
 
+	/**
+	 * @param Closure(): MappedObjectType $typeCreator
+	 */
 	private function createMappedObjectContext(
 		Options $options,
-		MappedObjectType $type,
+		Closure $typeCreator,
 		bool $initializeObjects
 	): MappedObjectContext
 	{
@@ -192,7 +197,7 @@ private function createMappedObjectContext(
 			$this->ruleManager,
 			$this,
 			$options,
-			$type,
+			$typeCreator,
 			$initializeObjects,
 		);
 	}
@@ -466,13 +471,14 @@ private function createFieldContext(
 	): FieldContext
 	{
 		$parentType = $mappedObjectContext->getType();
+		$typeCreator = static fn (): Type => $parentType->getField($fieldName);
 
 		return new FieldContext(
 			$this->metaLoader,
 			$this->ruleManager,
 			$this,
 			$mappedObjectContext->getOptions()->createClone(),
-			$parentType->getFields()[$fieldName],
+			$typeCreator,
 			$meta->getDefault(),
 			$mappedObjectContext->shouldInitializeObjects(),
 			$fieldName,
@@ -710,8 +716,9 @@ public function processSkippedFields(
 		$skippedFieldsContext = $this->skippedMap->getSkippedFieldsContext($object);
 
 		$type = $skippedFieldsContext->getType();
+		$typeCreator = static fn (): MappedObjectType => $type;
 		$options ??= $skippedFieldsContext->getOptions();
-		$mappedObjectContext = $this->createMappedObjectContext($options, $type, true);
+		$mappedObjectContext = $this->createMappedObjectContext($options, $typeCreator, true);
 		$skippedFields = $skippedFieldsContext->getSkippedFields();
 
 		$meta = $this->metaLoader->load($class);
diff --git a/src/Tester/TesterDependencies.php b/src/Tester/TesterDependencies.php
index 046337cc..001eb6ea 100644
--- a/src/Tester/TesterDependencies.php
+++ b/src/Tester/TesterDependencies.php
@@ -14,6 +14,7 @@
 use Orisai\ObjectMapper\Processing\Processor;
 use Orisai\ObjectMapper\Rules\DefaultRuleManager;
 use Orisai\ObjectMapper\Types\MessageType;
+use Orisai\ObjectMapper\Types\Type;
 use ReflectionProperty;
 
 final class TesterDependencies
@@ -82,7 +83,7 @@ public function createFieldContext(
 			$this->ruleManager,
 			$this->processor,
 			$options !== null ? $options->createClone() : new Options(),
-			new MessageType('test'),
+			static fn (): Type => new MessageType('test'),
 			$defaultValueMeta ?? DefaultValueMeta::fromNothing(),
 			$initializeObjects,
 			'test',
diff --git a/src/Types/ArrayShapeType.php b/src/Types/ArrayShapeType.php
index 3d59e87a..0e69a76d 100644
--- a/src/Types/ArrayShapeType.php
+++ b/src/Types/ArrayShapeType.php
@@ -3,6 +3,7 @@
 namespace Orisai\ObjectMapper\Types;
 
 use Closure;
+use Orisai\Exceptions\Logic\InvalidState;
 use Orisai\ObjectMapper\Exception\WithTypeAndValue;
 
 class ArrayShapeType implements Type
@@ -37,6 +38,28 @@ public function overwriteInvalidField($field, WithTypeAndValue $typeAndValue): v
 		$this->invalidFields[$field] = $typeAndValue;
 	}
 
+	/**
+	 * @param int|string $field
+	 *
+	 * @internal
+	 */
+	public function getField($field): Type
+	{
+		$type = $this->fields[$field] ?? null;
+
+		if ($type === null) {
+			throw InvalidState::create()
+				->withMessage("Cannot get field '$field' because it was never set.");
+		}
+
+		if ($type instanceof Closure) {
+			$type = $type();
+			$this->fields[$field] = $type;
+		}
+
+		return $type;
+	}
+
 	/**
 	 * @return array<int|string, Type>
 	 */
@@ -46,6 +69,7 @@ public function getFields(): array
 		foreach ($this->fields as $field => $type) {
 			if ($type instanceof Closure) {
 				$type = $type();
+				$this->fields[$field] = $type;
 			}
 
 			$fields[$field] = $type;
diff --git a/tests/Unit/Types/ArrayShapeTypeTest.php b/tests/Unit/Types/ArrayShapeTypeTest.php
index 6cc50615..7cb8bf05 100644
--- a/tests/Unit/Types/ArrayShapeTypeTest.php
+++ b/tests/Unit/Types/ArrayShapeTypeTest.php
@@ -2,10 +2,13 @@
 
 namespace Tests\Orisai\ObjectMapper\Unit\Types;
 
+use Orisai\Exceptions\Logic\InvalidState;
 use Orisai\ObjectMapper\Exception\ValueDoesNotMatch;
 use Orisai\ObjectMapper\Processing\Value;
 use Orisai\ObjectMapper\Types\ArrayShapeType;
 use Orisai\ObjectMapper\Types\MessageType;
+use Orisai\ObjectMapper\Types\SimpleValueType;
+use Orisai\ObjectMapper\Types\Type;
 use PHPUnit\Framework\TestCase;
 
 final class ArrayShapeTypeTest extends TestCase
@@ -103,19 +106,36 @@ public function testFields(): void
 	public function testFieldFromClosure(): void
 	{
 		$type = new ArrayShapeType();
-		$type->addField('field', static fn (): MessageType => new MessageType('test'));
+		$type->addField('field', static fn (): Type => new MessageType('test'));
+		$type->addField('field2', static fn (): Type => new SimpleValueType('string'));
 
 		$expectedFields = [
-			'field' => new MessageType('test'),
+			'field' => $t1 = new MessageType('test'),
+			'field2' => $t2 = new SimpleValueType('string'),
 		];
 
+		self::assertEquals($t1, $type->getField('field'));
+		self::assertSame($type->getField('field'), $type->getField('field'));
+
 		$fields = $type->getFields();
 		self::assertEquals($expectedFields, $fields);
 		self::assertNotSame($expectedFields, $fields);
 
 		$fields2 = $type->getFields();
 		self::assertEquals($fields, $fields2);
-		self::assertNotSame($fields, $fields2);
+		self::assertSame($fields, $fields2);
+
+		self::assertEquals($t2, $type->getField('field2'));
+	}
+
+	public function testGetUnknownField(): void
+	{
+		$type = new ArrayShapeType();
+
+		$this->expectException(InvalidState::class);
+		$this->expectExceptionMessage("Cannot get field 'unknown' because it was never set.");
+
+		$type->getField('unknown');
 	}
 
 }