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Implement image waterfall layout in uni-app and optimize performance.

Consider optimizing from the following aspects:

1. Using Virtual Lists: For loading a large number of images, you can use virtual list technology to render only the images visible on the screen, and not load the images that do not enter the viewport, thereby reducing memory usage and improving performance.
2. Lazy loading of images: Lazy loading of images can ensure that loading begins only when the image enters the visible area, reducing the amount of data loaded for the first time.
3. Cache loaded images: Cache the loaded images to avoid loading the same images repeatedly.
4. Loading hints and error handling: Display loading prompts during the image loading process and error prompts when loading fails to improve user experience.

Example:

                                   

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