• Design your map for performance
• Cache your map services
• Evaluate the image format that your map cache is built with
• Avoid using Internet Explorer 6 when the Web application contains multiple cached services in PNG24 format
• Use ArcGIS Server Internet connections when possible
• Ensure the Overview Map control uses static mode
• Configure the TOC control to optimize performance
• Remove unnecessary Web controls
• Configure your web services to avoid per-request impersonation
• Use good coding practices
• Avoid unnecessarily large queries

via esri