Is your portfolio lagging when you edit it in InDesign? A quick way to get faster editing is to lower the display performance of your links. There are three options; Fast Display, Typical Display, and High Quality Display. Fast display will represent the image with a gray box. Typical display will show a low quality representation of the image, and High Quality display shows a very high quality image (duh).
To change your display performance:
Navigate to the menu bar
Click "View", and scroll down toe "Display Performance"
Select either "Fast Display", "Typical Display", or "High Quality Display"