The quality ranges from text (fastest performance, but lowest quality) to antialiased text (better quality, but slower performance) to ClearType text (best quality on an LCD display).
Each character is drawn using its antialiased glyph bitmap without hinting. Better quality due to antialiasing. Stem width differences may be noticeable because hinting is turned off.
Each character is drawn using its antialiased glyph bitmap with hinting. Much better quality due to antialiasing, but at a higher performance cost.
Each character is drawn using its glyph ClearType bitmap with hinting. The highest quality setting. Used to take advantage of ClearType font features.
Each character is drawn using its glyph bitmap. Hinting is not used.
Each character is drawn using its glyph bitmap. Hinting is used to improve character appearance on stems and curvature.
Each character is drawn using its glyph bitmap, with the system default rendering hint. The text will be drawn using whatever font-smoothing settings the user has selected for the system.