KB0128: PowerPoint is slow when editing charts
PowerPoint slows down significantly, e.g., when editing MS Graph objects. This can also occur when using think-cell, because most charts in think-cell are composed using an MS Graph object.
A possible cause is that msiexec.exe is running in the background, occupying your computer's CPU. To check if this is the reason for the slow-down, open the Task Manager and look for msiexec.exe.
This is a known problem that is related to registry access rights. Please refer to Microsoft's web site for details: