Optimizing for Download Speed

At modem speeds, expect page to load at 1KB to3KB/sec, so you'll probably want to limit the entire page to 45KB or less.

• Don't use images you don't need. Consider alternatives (e.g. LI, HR, tables)
• For larger images, consider using thumbnails then linking to the larger image:
    <A HREF="photo-full.gif"><IMG SRC="photo-thumb.gif"></A>
  But don't create thumbnails by browser-side scaling!
• Interlace your larger GIF files
• Include HEIGHT= and WIDTH= on all images
• Use a 216-color palette if possible (or smaller, e.g. 2, 4, or 16 color)
• Use JPEG (at lowest feasible quality setting) for continuous-tone graphics
• Use GIF for line art and solid colors
• Consider special-purpose optimization software, e.g., DeBabelizer, Fireworks

Next: Exercise: more image manipulation