The Two Lines of CSS That Tanked Performance (120fps to 40fps)
Briefly

The animation, though visually appealing on Chrome and Safari, suffers from significant frame rate drops on Firefox, causing a noticeable decline in user experience.
The CSS animation utilizes two divs, where .background-gradient creates the full gradient background and .background-mask creates a fixed dotted overlay that animates to create a dynamic visual effect.
Animation performance varies across browsers due to differences in how CSS properties are rendered, emphasizing the importance of understanding the browser's layout, paint, and composite stages.
For optimal animation across platforms, developers should pay attention to CSS properties used, as not all properties animate efficiently, impacting performance in different browsers.
Read at Component-odyssey
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