Copy and Paste Picture - from Excel
It is possible to copy your charts as pictures.
This will help to reduce the file size of your presentations.
Selecting the Chart Area
Select the Chart Area (black handles).
Selecting the Shape Object
Highlight the chart in Excel (with white handles)
Pasting into PowerPoint
Select the slide you want to insert the chart on and select (Edit > Paste) or alternatively press (Ctrl + "V").
Resizing the picture once in PowerPoint will distort all the text.