Google SEO
Best practices — web.dev
How do you defer non-critical resources?
Lazy-load images below the fold, defer nonessential third-party scripts and inline critical CSS to accelerate the first visible render.
Further analysis
Use this entry as an audit checkpoint. The cited source establishes the context; the direct answer identifies what to check before choosing an action.
In SFT, this topic relates to Structure. Check whether the signal is visible on the page, connected to the rest of the website and supported by understandable evidence.
Related search terms include lazy loading, render blocking, critical CSS. Use them to describe the issue in a brief, audit or answer page.
Applying SFT
Structure turns a rule into readable architecture: headings, URLs, structured data, visible content and clear hierarchy.