diff --git a/YACReaderLibrary/db/folder_model.cpp b/YACReaderLibrary/db/folder_model.cpp
index e362f5f1..f54fd7ea 100644
--- a/YACReaderLibrary/db/folder_model.cpp
+++ b/YACReaderLibrary/db/folder_model.cpp
@@ -547,7 +547,8 @@ void FolderModel::deleteFolder(const QModelIndex &mi)
     {
         QSqlDatabase db = DataBaseManagement::loadDatabase(_databasePath);
         DBHelper::removeFromDB(&f, db);
-        DBHelper::updateChildrenInfo(item->parent()->id, db);
+        auto folder = DBHelper::updateChildrenInfo(item->parent()->id, db);
+        DBHelper::propagateFolderUpdatesToParent(folder, db);
         connectionName = db.connectionName();
     }
     QSqlDatabase::removeDatabase(connectionName);
@@ -560,7 +561,8 @@ void FolderModel::updateFolderChildrenInfo(qulonglong folderId)
     QString connectionName = "";
     {
         QSqlDatabase db = DataBaseManagement::loadDatabase(_databasePath);
-        DBHelper::updateChildrenInfo(folderId, db);
+        auto folder = DBHelper::updateChildrenInfo(folderId, db);
+        DBHelper::propagateFolderUpdatesToParent(folder, db);
         connectionName = db.connectionName();
     }
     QSqlDatabase::removeDatabase(connectionName);
diff --git a/YACReaderLibrary/db_helper.cpp b/YACReaderLibrary/db_helper.cpp
index 416414ae..0e434ce1 100644
--- a/YACReaderLibrary/db_helper.cpp
+++ b/YACReaderLibrary/db_helper.cpp
@@ -727,8 +727,57 @@ void DBHelper::update(const Folder &folder, QSqlDatabase &db)
     updateFolderInfo.exec();
 }
 
-void DBHelper::updateChildrenInfo(const Folder &folder, QSqlDatabase &db)
+void DBHelper::propagateFolderUpdatesToParent(const Folder &folder, QSqlDatabase &db)
 {
+    auto currentParentId = folder.parentId;
+    auto currentId = folder.id;
+    while (currentParentId != 1) {
+        auto f = loadFolder(currentParentId, db);
+        currentParentId = f.parentId;
+        currentId = f.id;
+    }
+
+    if (currentId != folder.id) {
+        updateChildrenInfo(currentId, db);
+    }
+}
+
+Folder DBHelper::updateChildrenInfo(qulonglong folderId, QSqlDatabase &db)
+{
+    auto folder = loadFolder(folderId, db);
+    QList<LibraryItem *> subitems;
+    QList<LibraryItem *> subfolders = DBHelper::getFoldersFromParent(folderId, db, false);
+    QList<LibraryItem *> comics = DBHelper::getComicsFromParent(folderId, db, false);
+
+    QList<LibraryItem *> updatedSubfolders;
+    for (auto sf : subfolders) {
+        updatedSubfolders.append(new Folder(updateChildrenInfo(static_cast<Folder *>(sf)->id, db)));
+    }
+
+    subitems.append(updatedSubfolders);
+    subitems.append(comics);
+
+    std::sort(subitems.begin(), subitems.end(), naturalSortLessThanCILibraryItem);
+
+    QString coverHash = "";
+    for (auto item : subitems) {
+        if (item->isDir()) {
+            auto f = static_cast<Folder *>(item);
+            auto firstChildHash = f->getFirstChildHash();
+            if (!firstChildHash.isEmpty()) {
+                coverHash = firstChildHash;
+                break;
+            }
+        } else {
+            auto c = static_cast<ComicDB *>(item);
+            coverHash = c->info.hash;
+            break;
+        }
+    }
+
+    folder.setNumChildren(subfolders.count() + comics.count());
+    folder.setFirstChildHash(coverHash);
+
     QSqlQuery updateFolderInfo(db);
     updateFolderInfo.prepare("UPDATE folder SET "
                              "numChildren = :numChildren, "
@@ -736,39 +785,30 @@ void DBHelper::updateChildrenInfo(const Folder &folder, QSqlDatabase &db)
                              "WHERE id = :id ");
     updateFolderInfo.bindValue(":numChildren", folder.getNumChildren());
     updateFolderInfo.bindValue(":firstChildHash", folder.getFirstChildHash());
-    updateFolderInfo.bindValue(":id", folder.id);
-    updateFolderInfo.exec();
-}
-
-void DBHelper::updateChildrenInfo(qulonglong folderId, QSqlDatabase &db)
-{
-    QList<LibraryItem *> subfolders = DBHelper::getFoldersFromParent(folderId, db, false);
-    QList<LibraryItem *> comics = DBHelper::getComicsFromParent(folderId, db, true);
-
-    ComicDB *firstComic = NULL;
-    if (comics.count() > 0)
-        firstComic = static_cast<ComicDB *>(comics.first());
-
-    QSqlQuery updateFolderInfo(db);
-    updateFolderInfo.prepare("UPDATE folder SET "
-                             "numChildren = :numChildren, "
-                             "firstChildHash = :firstChildHash "
-                             "WHERE id = :id ");
-    updateFolderInfo.bindValue(":numChildren", subfolders.count() + comics.count());
-    updateFolderInfo.bindValue(":firstChildHash", firstComic != NULL ? firstComic->info.hash : "");
     updateFolderInfo.bindValue(":id", folderId);
     updateFolderInfo.exec();
+
+    qDeleteAll(subfolders);
+    qDeleteAll(updatedSubfolders);
+    qDeleteAll(comics);
+
+    return folder;
 }
 
 void DBHelper::updateChildrenInfo(QSqlDatabase &db)
 {
+    QElapsedTimer timer;
+    timer.start();
+
     QSqlQuery selectQuery(db); // TODO check
-    selectQuery.prepare("SELECT id FROM folder");
+    selectQuery.prepare("SELECT id FROM folder f WHERE f.parentId = 1");
     selectQuery.exec();
 
     while (selectQuery.next()) {
         DBHelper::updateChildrenInfo(selectQuery.value(0).toULongLong(), db);
     }
+
+    qDebug() << timer.elapsed();
 }
 
 void DBHelper::updateProgress(qulonglong libraryId, const ComicInfo &comicInfo)
diff --git a/YACReaderLibrary/db_helper.h b/YACReaderLibrary/db_helper.h
index 3b5e5820..0d552ca3 100644
--- a/YACReaderLibrary/db_helper.h
+++ b/YACReaderLibrary/db_helper.h
@@ -66,8 +66,8 @@ public:
     static void update(ComicInfo *comicInfo, QSqlDatabase &db);
     static void updateRead(ComicInfo *comicInfo, QSqlDatabase &db);
     static void update(const Folder &folder, QSqlDatabase &db);
-    static void updateChildrenInfo(const Folder &folder, QSqlDatabase &db);
-    static void updateChildrenInfo(qulonglong folderId, QSqlDatabase &db);
+    static void propagateFolderUpdatesToParent(const Folder &folder, QSqlDatabase &db);
+    static Folder updateChildrenInfo(qulonglong folderId, QSqlDatabase &db);
     static void updateChildrenInfo(QSqlDatabase &db);
     static void updateProgress(qulonglong libraryId, const ComicInfo &comicInfo);
     static void setComicAsReading(qulonglong libraryId, const ComicInfo &comicInfo);
diff --git a/YACReaderLibrary/library_creator.cpp b/YACReaderLibrary/library_creator.cpp
index dfea43ab..4058dd58 100644
--- a/YACReaderLibrary/library_creator.cpp
+++ b/YACReaderLibrary/library_creator.cpp
@@ -185,9 +185,10 @@ void LibraryCreator::run()
                 update(QDir(_source));
             }
 
-            if (partialUpdate)
-                DBHelper::updateChildrenInfo(folderDestinationModelIndex.data(FolderModel::IdRole).toULongLong(), _database);
-            else
+            if (partialUpdate) {
+                auto folder = DBHelper::updateChildrenInfo(folderDestinationModelIndex.data(FolderModel::IdRole).toULongLong(), _database);
+                DBHelper::propagateFolderUpdatesToParent(folder, _database);
+            } else
                 DBHelper::updateChildrenInfo(_database);
 
             _database.commit();
@@ -199,9 +200,9 @@ void LibraryCreator::run()
         // si estabamos en modo creación, se está añadiendo una librería que ya existía y se ha actualizado antes de añadirse.
         if (!partialUpdate) {
             if (!creation) {
-                emit(updated());
+                emit updated();
             } else {
-                emit(created());
+                emit created();
             }
         }
         QLOG_INFO() << "Update library END";
@@ -377,16 +378,20 @@ void LibraryCreator::update(QDir dirS)
     bool updated;
     int i, j;
     for (i = 0, j = 0; (i < lenghtS) || (j < lenghtD);) {
-        if (stopRunning)
+        if (stopRunning) {
+            qDeleteAll(listD);
             return;
+        }
         updated = false;
         if (i >= lenghtS) // finished source files/dirs
         {
             // QLOG_WARN() << "finished source files/dirs" << dirS.absolutePath();
             // delete listD //from j
             for (; j < lenghtD; j++) {
-                if (stopRunning)
+                if (stopRunning) {
+                    qDeleteAll(listD);
                     return;
+                }
                 DBHelper::removeFromDB(listD.at(j), (_database));
             }
             updated = true;
@@ -396,8 +401,10 @@ void LibraryCreator::update(QDir dirS)
             // QLOG_WARN() << "finished library files/dirs" << dirS.absolutePath();
             // create listS //from i
             for (; i < lenghtS; i++) {
-                if (stopRunning)
+                if (stopRunning) {
+                    qDeleteAll(listD);
                     return;
+                }
                 QFileInfo fileInfoS = listS.at(i);
                 if (fileInfoS.isDir()) // create folder
                 {
@@ -548,4 +555,6 @@ void LibraryCreator::update(QDir dirS)
                 }
         }
     }
+
+    qDeleteAll(listD);
 }
diff --git a/YACReaderLibrary/server/controllers/v1/foldercontroller.cpp b/YACReaderLibrary/server/controllers/v1/foldercontroller.cpp
index fbe02168..0ba2ff78 100644
--- a/YACReaderLibrary/server/controllers/v1/foldercontroller.cpp
+++ b/YACReaderLibrary/server/controllers/v1/foldercontroller.cpp
@@ -308,5 +308,7 @@ void FolderController::service(HttpRequest &request, HttpResponse &response)
     t.setVariable("page", QString("%1").arg(page + 1));
     t.setVariable("pages", QString("%1").arg(numPages));
 
+    qDeleteAll(folderContent);
+
     response.write(t.toUtf8(), true);
 }
diff --git a/YACReaderLibrary/server/controllers/v2/foldercontentcontroller_v2.cpp b/YACReaderLibrary/server/controllers/v2/foldercontentcontroller_v2.cpp
index 836fa5ee..9c59f67c 100644
--- a/YACReaderLibrary/server/controllers/v2/foldercontentcontroller_v2.cpp
+++ b/YACReaderLibrary/server/controllers/v2/foldercontentcontroller_v2.cpp
@@ -63,6 +63,8 @@ void FolderContentControllerV2::serviceContent(const int &library, const qulongl
         }
     }
 
+    qDeleteAll(folderContent);
+
     QJsonDocument output(items);
 
     response.write(output.toJson(QJsonDocument::Compact));
diff --git a/common/folder.cpp b/common/folder.cpp
index c6a0cd54..288ad66e 100644
--- a/common/folder.cpp
+++ b/common/folder.cpp
@@ -34,6 +34,9 @@ Folder &Folder::operator=(const Folder &other)
     this->finished = other.finished;
     this->completed = other.completed;
     this->manga = other.manga;
+    this->numChildren = other.numChildren;
+    this->firstChildHash = other.firstChildHash;
+    this->customImage = other.customImage;
 
     return *this;
 }