improved flag performances issues without a patch but with hook_module_implements_alter in materio_flag

web/modules/custom/materio_flag/materio_flag.module

@@ -1 +1,43 @@
 <?php
+
+/**
+ * @file
+ * Contains materio_flag.module.
+ */
+
+/**
+ * Implements hook_module_implements_alter().
+ *
+ * flag_lists creates one Flag *config* entity per user list (1700+ on this
+ * site). Several flag.module hooks call FlagService::getAllFlags() and loop over
+ * every flag for each entity view and each entity form, running an isFlagged()
+ * query and an access check per flag. This makes node view and, above all, node
+ * edit (flag_form_alter) time out.
+ *
+ * All these flags are configured with show_in_links / show_as_field /
+ * show_on_form / show_contextual_link = FALSE and are only consumed through
+ * materio_flag (controllers/routes) and the decoupled Vue app, so flag's native
+ * entity integration produces nothing visible here. We therefore remove these
+ * expensive implementations instead of patching flag.module.
+ */
+function materio_flag_module_implements_alter(&$implementations, $hook) {
+  $hooks_to_remove = [
+    // flag_form_alter(): loops all flags on every content entity form
+    // (node edit) -> main cause of the 504 gateway timeout.
+    'form_alter',
+    // flag_entity_view(): builds a flag field render per flag on entity view.
+    'entity_view',
+    // flag_entity_build_defaults_alter(): sets max-age=0 per contextual flag.
+    'entity_build_defaults_alter',
+    // flag_entity_view_alter(): adds flag metadata to contextual links.
+    'entity_view_alter',
+    // flag_entity_extra_field_info(): declares a pseudo-field per flag.
+    'entity_extra_field_info',
+    // flag_entity_operation(): adds flag operation links per flag.
+    'entity_operation',
+  ];
+
+  if (in_array($hook, $hooks_to_remove, TRUE) && isset($implementations['flag'])) {
+    unset($implementations['flag']);
+  }
+}