When you build an image gallery with fade-in effects using AOS, it is important to keep performance in mind, especially as the number of images increases. Large, unoptimized images can slow page loading and make animations feel sluggish. To ensure smooth animations, always optimize your image sizes before adding them to your gallery. Serving appropriately sized images helps reduce bandwidth usage and makes animations trigger more responsively as users scroll.

You should also limit the number of images that animate at the same time. If too many images fade in simultaneously, browsers may struggle to animate them smoothly, especially on lower-powered devices. Staggering the animations or using the once option in AOS can help, as it prevents repeated animation triggers and reduces unnecessary workload. By focusing on efficient image loading and thoughtful animation timing, you can create a visually appealing gallery that remains responsive and smooth for all users.