How to optimize the drag and drop lag caused by absolute positioning of CSS?

Optimize the absolute positioning of CSS and improve drag and drop smoothness

In web development, position: absolute is often used to accurately locate elements, but when handling large amounts of element dragging, it may lead to performance bottlenecks and dragging and stuttering. This article provides an efficient optimization solution for this problem.

The root cause of the problem is that frequent use of position: absolute combined with drag events ( mousedown , mousemove , mouseup ) will trigger the browser to repeatedly calculate and repaint the page layout, especially when there are many elements, the performance loss is significant, and JavaScript threads can handle UI updates even worse.

The core of the solution is to reduce the number of browser layouts and redraws. We can use CSS' transform: translate(x, y) instead of left and top attributes to move elements. translate only triggers the synthetic layer operation and will not affect the page layout and redraw, thereby significantly improving the smoothness of drag and drop, especially when there are many elements. In this way, the browser only needs to update the element screen position without recalculating the entire page layout, greatly improving performance.

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