When you scroll through a presentation in Office 2007 or 2010, it takes several seconds to open specific slides. These slides contain charts with a large number of boxed labels or axis breaks. E.g., Gantt charts require many boxed labels. When you open a presentation with such a slide as first slide, it will take several seconds to open the presentation.
A boxed label is a label that is placed on top of lines or cluttered background. For better legibility, think-cell renders the background of this label non-transparent, but matching the slide background. The same is done for axis breaks.
In Office 2003 and 2013, you can scroll through and open the same presentation swiftly.
If possible, reset the slide background to a Solid fill. Please note that the current slide background may originate from a specific slide or from the slide master.
think-cell boxed labels and axis breaks use PowerPoint text boxes and freeforms with the fill Slide background fill. In combination with certain slide backgrounds (like image or texture fills) PowerPoint shows a very poor performance when loading slides.
This problem is a performance bug in PowerPoint 2007 and 2010. PowerPoint 2013 is not affected. The bug has been reported to Microsoft. If your company has a Microsoft Office Support contract and you want to contact Microsoft to ask for a fix, you may refer to Microsoft case number MS REG:111063048645423.