diff --git a/Containers/mastercontainer/Dockerfile b/Containers/mastercontainer/Dockerfile
index af14f423..ab8e81f9 100644
--- a/Containers/mastercontainer/Dockerfile
+++ b/Containers/mastercontainer/Dockerfile
@@ -53,6 +53,9 @@ RUN set -ex; \
         build-base; \
     pecl install APCu-5.1.28; \
     docker-php-ext-enable apcu; \
+    { \
+        echo 'apc.shm_size=32M'; \
+    } >> /usr/local/etc/php/conf.d/docker-php-ext-apcu.ini; \
     docker-php-ext-enable opcache; \
     { \
         echo 'opcache.enable=1'; \
diff --git a/php/src/ContainerDefinitionFetcher.php b/php/src/ContainerDefinitionFetcher.php
index 44b1a4f9..e4625a24 100644
--- a/php/src/ContainerDefinitionFetcher.php
+++ b/php/src/ContainerDefinitionFetcher.php
@@ -39,7 +39,14 @@ readonly class ContainerDefinitionFetcher {
      */
     private function GetDefinition(): array
     {
-        $data = json_decode((string)file_get_contents(DataConst::GetContainersDefinitionPath()), true, 512, JSON_THROW_ON_ERROR);
+        $containersDefinitionPath = DataConst::GetContainersDefinitionPath();
+        $cacheKey = 'containers-json-' . $containersDefinitionPath;
+        $cachedJson = apcu_fetch($cacheKey);
+        if (!is_string($cachedJson)) {
+            $cachedJson = (string)file_get_contents($containersDefinitionPath);
+            apcu_add($cacheKey, $cachedJson);
+        }
+        $data = json_decode($cachedJson, true, 512, JSON_THROW_ON_ERROR);
 
         // We store this information for later because we need to use it to distinct between community containers and default containers.
         $standardContainerNames = array_column($data['aio_services_v1'], 'container_name');