Issue Summary

The speed to rendering the PowerPoint file via Office Powerpoint Macro is slow which causes the first-time render action to result in a broken image

Steps to Reproduce

1. Upload the PowerPoint file which has multiple slides to Confluence as an example file attached (CONFSERVER-99337.pptx). 
2. On the uploaded page, insert an Office PowerPoint Macro and select the uploaded file. 
3. Save the page and navigate the slides. 

Expected Results

The speed of Confluence rendering the slides should be faster and shouldn't cause a broken image while previewing the file. 

Actual Results

The speed is slower and potentially causes the broken image as the screenshot below:

Please refer to the screen video below about how it looks like when affected. 

• CONFSERVER-99337_affected_screen_video.mov

Workaround

Apply the dark feature, officeconnector.slide.sandbox.bypass, will increase the speed of the slide rendering as the steps below: 

1. Confirm the issue exists.
2. Delete the PowerPoint file from viewpageattachments.action.
3. Enable the dark feature as below via admin/darkfeatures.action:

   officeconnector.slide.sandbox.bypass
   

4. Clear the Confluence cache via admin/cache/showStatistics.action
5. Upload the attachment again to see if it helps.