AOS Slow

AOS (Animate On Scroll) is a popular library for animating elements on a webpage as the user scrolls. While it can add a lot of visual interest to a site, it can also significantly slow down its performance.

How AOS Works

AOS works by adding data attributes to HTML elements on a webpage. These attributes contain information about the animation to be applied to the element, such as the type of animation, duration, and delay.

When the user scrolls to a point where an animated element is in view, AOS triggers the animation based on the data attributes.

Performance Issues with AOS

AOS can slow down a webpage's performance in a number of ways:

• Increase in page size: AOS adds extra code to the webpage, which can increase the page size and load time.
• CPU usage: AOS animations can be processor intensive, especially on mobile devices with slower CPUs.
• Browser painting: When an AOS animation is triggered, the browser has to perform a number of painting operations to render the animation. This can cause stuttering and jank, especially on older browsers or devices with limited resources.

Mitigating AOS Slowdowns

There are several ways to mitigate the performance issues caused by AOS:

• Minimize animations: Only use AOS animations when necessary, and use them sparingly. Avoid animating a large number of elements on a single page.
• Optimize images: Use compressed and optimized images to reduce page size and load time.
• Respect the user's preferences: Allow the user to disable animations or adjust their speed or intensity. Use the prefers-reduced-motion media query to detect the user's preferences.
• Use a performance analyzer: Use a performance analyzer tool, such as Lighthouse, to identify areas of the webpage that are causing slowdowns.