Which is an example of a situation when an unnecessary resource negatively impacts the user experience?

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Which is an example of a situation when an unnecessary resource negatively impacts the user experience.

1:-optimized images
2:-one web font
3:-lazy loading

4:-a photo carousel on the homepage that allows the visitor to preview multiple photos with a quick click.


Answer is 4:-a photo carousel on the homepage that allows the visitor to preview multiple photos with a quick click.