- Use Facelets instead of JSP
- If possible, always use HTML instead of JSF tags
- Never put logic in getters because they can be called multiple times - especially for the rendered attribute
- Avoid much logic in EL expression
- Avoid using h:outputText. Just use EL expressions. If you need to escape HTML, it's better to use a EL function
- Use AJAX as much as possible
- Only process and update components which are really required to process or update
- Cache data, which is required multiple times in the same view, in @RequestScoped beans
- Avoid using @SessionScoped, @ViewScoped and other long living scopes
- Split your beans. Its better to have a seperate bean for logic and a seperate bean for values which are required for multiple requests (@ViewScoped, @ViewAccessScoped...). I call them *Controller and *StateHolder