diff --git a/iommi/table.py b/iommi/table.py
index 805e8ff5..eab7acbd 100644
--- a/iommi/table.py
+++ b/iommi/table.py
@@ -1937,6 +1937,7 @@ def on_refine_done(self):
         self.initial_rows = self.rows
         self.header = HeaderConfig(_name='header', **self.header).refine_done(parent=self)
         self.row = RowConfig(**self.row).refine_done(parent=self)
+        self._preprocessed_rows = None
 
         # In bind initial_rows will be used to set these 3 (in that order)
         self.sorted_rows = None
@@ -2220,7 +2221,8 @@ def on_bind(self) -> None:
         bind_member(self, name='bulk_container')
 
     def get_visible_rows(self):
-        self.visible_rows = self.parts.page.rows
+        if self.visible_rows is None:
+            self.visible_rows = self.parts.page.rows
         return self.visible_rows
 
     def _bind_query(self):
@@ -2280,7 +2282,6 @@ def render_actions(self):
     def _prepare_auto_rowspan(self):
         auto_rowspan_columns = [column for column in values(self.columns) if column.auto_rowspan]
         if auto_rowspan_columns:
-            self.visible_rows = list(self.get_visible_rows())
             no_value_set = object()
             for column in auto_rowspan_columns:
                 if column.cell.attrs.get('rowspan', no_value_set) is not no_value_set:
@@ -2412,12 +2413,13 @@ def cells_for_rows(self, paginate=True):
             rows = self.get_visible_rows()
         else:
             rows = self.sorted_and_filtered_rows
-        preprocessed_rows = self.invoke_callback(self.preprocess_rows, rows=rows)
+        if not self._preprocessed_rows:
+            self._preprocessed_rows = list(self.invoke_callback(self.preprocess_rows, rows=rows))
 
         row_groups = [c for c in values(self.columns) if c.row_group.include]
         row_group_values = {c._name: None for c in row_groups}
 
-        for i, row in enumerate(preprocessed_rows):
+        for i, row in enumerate(self._preprocessed_rows):
             row = self.invoke_callback(self.preprocess_row, row=row)
             assert row is not None, 'preprocess_row must return the row'
 
diff --git a/iommi/table__tests.py b/iommi/table__tests.py
index 6df59661..19d5758c 100755
--- a/iommi/table__tests.py
+++ b/iommi/table__tests.py
@@ -4468,3 +4468,34 @@ def test_annotate_on_broken_filters():
             </tbody>
         """,
     )
+
+
+def test_auto_rowspan_and_render_twice_generator(NoSortTable):  # noqa: N803
+    class TestTable(NoSortTable):
+        foo = Column(auto_rowspan=True)
+
+    rows = [
+        Struct(foo=1),
+        Struct(foo=1),
+        Struct(foo=2),
+        Struct(foo=2),
+    ]
+
+    # language=html
+    expected_html = """
+        <table class="table" >
+            <thead>
+                <tr> <th class="first_column subheader"> Foo </th> </tr>
+            </thead>
+            <tbody>
+                <tr> <td rowspan="2"> 1 </td> </tr>
+                <tr> <td style="display: none"> 1 </td> </tr>
+                <tr> <td rowspan="2"> 2 </td> </tr>
+                <tr> <td style="display: none"> 2 </td> </tr>
+            </tbody>
+        </table>"""
+
+    t = TestTable(rows=(x for x in rows))
+    t = t.bind(request=req('get'))
+    verify_table_html(table=t, expected_html=expected_html)
+    verify_table_html(table=t, expected_html=expected_html)