Use the Display Performance dialog box to set transparency preferences. These preferences determine the on-screen quality of transparent objects in new documents and in documents saved with modified preferences. You can also set the preferences to turn on or off the display of transparency in the document. Turning off transparency in the display preferences doesn’t turn off transparency when printing or exporting the file.
Fast turns off transparency and sets the resolution to 24 dpi.
Typical displays low-resolution effects and sets the resolution to 72 dpi.
High Quality improves the display of effects, especially in PDF and EPS files, and sets the resolution to 144 dpi.