From fc239859603f091f4bf79f0564c09b27016f6945 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Wed, 18 Sep 2024 11:33:48 +0530
Subject: [PATCH] ...

---
 src/calibre/gui2/viewer/ui.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/calibre/gui2/viewer/ui.py b/src/calibre/gui2/viewer/ui.py
index 4061ae8b3e..6cd93c9eb6 100644
--- a/src/calibre/gui2/viewer/ui.py
+++ b/src/calibre/gui2/viewer/ui.py
@@ -557,6 +557,7 @@ class EbookViewer(MainWindow):
                 self.book_prepared.emit(True, {'base': ans, 'pathtoebook': pathtoebook, 'open_at': open_at, 'reloaded': reload_book})
 
     def prepare_notify(self):
+        performance_monitor('preparation started')
         self.book_preparation_started.emit()
 
     def load_finished(self, ok, data):