Optimize page performance: the best choice for redrawing, reflowing and reflowing

Repaint, reflow and reflow: how to choose the best solution?

In front-end development, optimizing web page performance is a very important task. Among them, the most critical point is how to reduce page redrawing, reflowing and reflowing to improve page rendering speed and performance. This article will introduce what redraw, reflow, and reflow are, and discuss how to choose the best option to optimize page performance.

Redraw, reflow and reflow are a series of processes that the browser performs when rendering a page. Redrawing means that the browser will redraw the element when its appearance changes. Reflow means that when the geometric properties of an element change, the browser needs to recalculate the position and size of the element. Reflow means that when the layout of the page changes, the browser needs to recalculate and re-render part or all of the page.

So, how to choose the best solution to reduce redraws, reflows and reflows? First, we can use some tools to detect redraws, reflows, and reflows on the page. Commonly used tools include Chrome DevTools and Firebug. Through these tools, we can see which elements are causing page redraws, reflows, and reflows, and their performance losses.

Next, we can minimize direct operations on the page. Generally speaking, using CSS to modify the appearance of an element can avoid redrawing and reflowing, while using JavaScript to modify the geometric properties of an element can trigger reflowing and reflowing. Therefore, if possible, we should try to avoid directly manipulating the geometric properties of elements and instead modify the appearance of elements by adding or removing CSS classes.

In addition, we can also use some techniques to optimize the layout of the page. For example, you can set elements that need to be frequently rearranged or reflowed to position:fixed or position:absolute, which can reduce the amount of layout calculations; you can put elements that need to be dynamically changed in a separate layer, which can reduce other Layout calculation of elements; you can use the transform property of CSS to animate elements to avoid triggering reflow and reflow.

In addition, there are some common performance optimization techniques that can help us reduce page redraws, reflows and reflows. For example, use debounce or throttle to limit the frequency of event triggers; use virtual lists or infinite scrolling to optimize the display of large amounts of data; use the CSS will-change attribute to predict changes in elements and tell the browser to optimize accordingly, etc.

Finally, we can also use some tools to automate page performance optimization. For example, you can use webpack to package and compress the static resources of the page; you can use babel to escape and optimize the code; you can use gulp or grunt to automatically build and optimize the page, etc.

In short, redrawing, reflowing and reflowing are important factors that affect page performance. By using tools, optimizing layouts, using techniques, and automating tools, we can choose the best solution to reduce page redraws, reflows, and reflows, thereby improving page rendering speed and performance. I hope this article can be helpful to everyone.

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