Merge pull request #254 from magento-gl/page_builder_performance_issue_247beta2

AC-9128 ::Performance issue- While saving the page its taking lots of time, after edit the page.

Author: sidolov

app/code/Magento/PageBuilder/view/adminhtml/web/template/page-builder.html

@@ -31,6 +31,6 @@
         <with args="stage">
             <render></render>
         </with>
-        <iframe width="1" height="1" attr="id: 'render_frame_' + id" sandbox="allow-scripts" style="display: none;"></iframe>
+        <iframe attr="id: 'render_frame_' + id" sandbox="allow-scripts" style="position: absolute; width:0; height:0; border: none;"></iframe>
     </if>
 </div>