<img Decoding="async" - Class="alignleft" Src="ht...

While async decoding is generally a best practice for secondary images, it can occasionally backfire for critical "above-the-fold" content:

: Because the browser might paint the rest of the page before the image is ready, the image may "pop in" suddenly after the surrounding text is already visible. <img decoding="async" class="alignleft" src="ht...

When a browser downloads an image, it must decode it before it can be displayed. By default, many browsers perform this synchronously, meaning they wait for the image to decode before showing the rest of the page content. While async decoding is generally a best practice

249: Decoding async, tree rings, and flexbox gap - CSS-Tricks 249: Decoding async, tree rings, and flexbox gap

: It allows text and other non-image content to appear sooner, rather than waiting for large images to be fully processed. The Trade-off: LCP and "Popping"

The attribute decoding="async" in an tag is a performance-focused hint that tells the browser to decode image data off the main thread. This prevents the CPU-intensive process of converting a compressed file (like a JPEG) into raw pixels from blocking the rendering of other critical content, such as text or interactive elements. Why decoding="async" Matters