The Lows Graphics mode will turn off background images. This will help accelerate page loading if you have internet caching disabled or clear your cache frequently.
The No Graphics mode will invert the background to white and darken text colors. This will help accelerate page loading (see above) and provide improved accessibility for users who dislike dark backgrounds.
Your selected preference can be changed at any time and will be remembered (via a cookie) for your current and future visits. The style can only be changed from the home page.