diff --git a/src/calibre/gui2/tweak_book/diff/view.py b/src/calibre/gui2/tweak_book/diff/view.py
index 8e8a78e8de..2b37e0e016 100644
--- a/src/calibre/gui2/tweak_book/diff/view.py
+++ b/src/calibre/gui2/tweak_book/diff/view.py
@@ -870,7 +870,7 @@ class DiffView(QWidget):  # {{{
         self.view.handle(1).update()
 
     def resized(self):
-        self.resize_timer.start(100)
+        self.resize_timer.start(300)
 
     def resize_debounced(self):
         self.view.resized()