diff --git a/src/ui/mixins/transformation.py b/src/ui/mixins/transformation.py
index 1f92419..8237448 100644
--- a/src/ui/mixins/transformation.py
+++ b/src/ui/mixins/transformation.py
@@ -375,6 +375,24 @@ class TransformationMixin:
             logger.error(f"Fehler beim Transformieren des TreeNode: {e}")
             QMessageBox.critical(self, "Fehler", f"Fehler beim Transformieren: {str(e)}")
 
+    def _get_cached_project_tools(self):
+        """
+        Gibt die aufgelösten Tool-Konfigurationen des aktuellen Projekts zurück (gecacht).
+
+        Der Cache wird invalidiert, sobald sich die Projekt-ID ändert.
+        """
+        project_id = self.project.id if self.project else None
+        if getattr(self, "_tool_cache_project_id", None) != project_id:
+            self._tool_cache_project_id = project_id
+            self._tool_cache = (
+                next((jvm for jvm in app_settings.java_vms if jvm.id == self.project.java_vm_id), None),
+                next((sj for sj in app_settings.saxon_jars if sj.id == self.project.saxon_jar_id), None),
+                next((af for af in app_settings.apache_fops if af.id == self.project.apache_fop_id), None),
+                next((dp for dp in app_settings.diff_pdfs if dp.id == self.project.diff_pdf_id), None),
+                next((xd for xd in app_settings.xsl_dirs if xd.id == self.project.xsl_dir_id), None),
+            )
+        return self._tool_cache
+
     def _create_transformation_job(
         self, xsl_file_obj: XslFile, xml_file_obj: XmlFile, xsl_file_item: QTreeWidgetItem | None = None
     ) -> TransformationJob | None:
@@ -394,12 +412,8 @@ class TransformationMixin:
                 QMessageBox.warning(self, "Fehler", "Kein Projekt geöffnet")
                 return None
 
-            # Hole Tool-Konfigurationen aus app_settings
-            java_vm = next((jvm for jvm in app_settings.java_vms if jvm.id == self.project.java_vm_id), None)
-            saxon_jar = next((sj for sj in app_settings.saxon_jars if sj.id == self.project.saxon_jar_id), None)
-            apache_fop = next((af for af in app_settings.apache_fops if af.id == self.project.apache_fop_id), None)
-            diff_pdf = next((dp for dp in app_settings.diff_pdfs if dp.id == self.project.diff_pdf_id), None)
-            xsl_dir = next((xd for xd in app_settings.xsl_dirs if xd.id == self.project.xsl_dir_id), None)
+            # Tool-Konfigurationen gecacht auflösen (einmalig pro Projekt)
+            java_vm, saxon_jar, apache_fop, diff_pdf, xsl_dir = self._get_cached_project_tools()
 
             # Prüfe ob alle Konfigurationen vorhanden sind
             if not all([java_vm, saxon_jar, apache_fop, diff_pdf, xsl_dir]):