To optimize a GUI for managing multiple smart devices, consider the following strategies:

1. Grouping and categorization: Organize devices by type, room, or function for easy navigation.

2. Customizable dashboards: Allow users to personalize their view with widgets, tiles, or cards representing individual devices or groups.

3. Hierarchical navigation: Use a tree-like structure to manage multiple devices and sub-devices.

4. Device status indicators: Display real-time status updates, such as online/offline, battery levels, or error notifications.

5. Unified controls: Provide consistent controls for similar devices, reducing cognitive load.

6. Bulk actions: Enable users to perform actions on multiple devices simultaneously.

7. Search and filtering: Implement search bars and filters to quickly find specific devices.

8. Real-time updates: Ensure the GUI reflects device changes instantly.

9. Contextual menus: Offer device-specific actions and settings through right-click or long-press menus.

10. Responsive design: Ensure the GUI adapts to various screen sizes and devices.

11. Clear labeling and icons: Use intuitive icons and labels to facilitate device identification.

12. User feedback: Provide visual and auditory cues for user interactions, like button presses or device responses.

By implementing these strategies, you can create an efficient and user-friendly GUI for managing multiple smart devices.