diff --git a/src/Adapter/ArrayContainerAdapter.php b/src/Adapter/ArrayContainerAdapter.php
index be05a2e..b3b53cc 100644
--- a/src/Adapter/ArrayContainerAdapter.php
+++ b/src/Adapter/ArrayContainerAdapter.php
@@ -17,6 +17,8 @@ class ArrayContainerAdapter implements ContainerInterface
      */
     private $arrayContainer;
 
+    private bool $useOptimizedLookup;
+
     /**
      * ArrayContainerAdapter constructor.
      * @param array|\ArrayAccess $arrayContainer
@@ -24,6 +26,7 @@ class ArrayContainerAdapter implements ContainerInterface
     public function __construct($arrayContainer)
     {
         $this->arrayContainer = $arrayContainer;
+        $this->useOptimizedLookup = is_object($arrayContainer) && method_exists($arrayContainer, 'getIfDefined');
     }
 
     /**
@@ -38,12 +41,41 @@ public function __construct($arrayContainer)
      */
     public function get($id)
     {
+        if ($this->useOptimizedLookup) {
+            try {
+                return $this->arrayContainer[$id];
+            } catch (\InvalidArgumentException $e) {
+                throw new ServiceNotFoundException("Service not found in container ($id).", 0, $e);
+            }
+        }
         if (!isset($this->arrayContainer[$id])) {
             throw new ServiceNotFoundException("Service not found in container ($id).");
         }
         return $this->arrayContainer[$id];
     }
 
+    /**
+     * Check if the entry exists and retrieve it in a single operation.
+     * Avoids the double container lookup of separate has() + get() calls.
+     * When the underlying container supports getIfDefined (e.g. JITContainer),
+     * this reduces provider loading from 3 calls to 1.
+     *
+     * @param string $id Identifier of the entry to look for.
+     * @param mixed $result Will be set to the entry value if found.
+     * @return bool True if the entry was found.
+     */
+    public function getIfDefined(string $id, mixed &$result): bool
+    {
+        if ($this->useOptimizedLookup) {
+            return $this->arrayContainer->getIfDefined($id, $result);
+        }
+        if (!isset($this->arrayContainer[$id])) {
+            return false;
+        }
+        $result = $this->arrayContainer[$id];
+        return true;
+    }
+
     /**
      * Returns true if the container can return an entry for the given identifier.
      * Returns false otherwise.
diff --git a/src/Injector.php b/src/Injector.php
index fa2f5c1..6eb273c 100644
--- a/src/Injector.php
+++ b/src/Injector.php
@@ -43,8 +43,11 @@ class Injector implements InjectorInterface
      */
     private array $autoCreateCache = [];
 
+    private readonly bool $hasGetIfDefined;
+
     public function __construct(private readonly ContainerInterface $container, private readonly ClassInspectorInterface $classInspector)
     {
+        $this->hasGetIfDefined = method_exists($container, 'getIfDefined');
     }
 
     /**
@@ -237,15 +240,22 @@ private function buildParameterArray($methodSignature, $providedParameters)
     private function buildParameterArrayFromContainer($methodSignature)
     {
         $parameters = [];
+        $container = $this->container;
+        $useOptimized = $this->hasGetIfDefined;
         foreach ($methodSignature as $position => $parameterData) {
             if (isset($parameterData['variadic'])) {
-                // variadic with no provided params = nothing to pipe
                 break;
             }
             $type = $parameterData['type'] ?? false;
             if ($type) {
-                if ($this->container->has($type)) {
-                    $parameters[$position] = $this->container->get($type);
+                if ($useOptimized) {
+                    $value = null;
+                    if ($container->getIfDefined($type, $value)) {
+                        $parameters[$position] = $value;
+                        continue;
+                    }
+                } elseif ($container->has($type)) {
+                    $parameters[$position] = $container->get($type);
                     continue;
                 }
                 if ($this->canAutoCreate($type)) {
diff --git a/src/Reflection/CachingClassInspector.php b/src/Reflection/CachingClassInspector.php
index 3e33937..8937d99 100644
--- a/src/Reflection/CachingClassInspector.php
+++ b/src/Reflection/CachingClassInspector.php
@@ -14,6 +14,11 @@ class CachingClassInspector implements ClassInspectorInterface
      */
     private array $constructorCache = [];
 
+    /**
+     * @var array<string, array>
+     */
+    private array $methodSignatureCache = [];
+
     public function __construct(
         private readonly ClassInspector $classInspector,
         private readonly ServiceCacheInterface $serviceCache,
@@ -93,6 +98,11 @@ public function methodIsPublic(string $class, string $method): bool
      */
     public function getMethodSignature(string $class, string $method): array
     {
+        $cacheKey = "$class::$method";
+        if (isset($this->methodSignatureCache[$cacheKey])) {
+            return $this->methodSignatureCache[$cacheKey];
+        }
+
         $key = "$class::{$method}::signature";
         if ($this->serviceCache->has($key)) {
             $value = $this->serviceCache->get($key);
@@ -101,6 +111,7 @@ public function getMethodSignature(string $class, string $method): array
             $this->serviceCache->set($key, $value);
         }
 
+        $this->methodSignatureCache[$cacheKey] = $value;
         return $value;
     }