What factors can cause delay or stopping of the HTML page rendering process in a browser?

Delays or stops in the process of rendering an HTML page in a browser can be caused by several factors:

• Blocking resources: if HTML contains links to external CSS or JavaScript files, the browser waits for their loading and execution before displaying the page.
• Synchronous JavaScript: scripts that execute synchronously block HTML parsing until they are completed.
• Slow server or network: delays in server response or slow connection increase load time.
• Large data volume: overly large HTML, CSS, or JS increases load and parsing time.
• Render-blocking resources: CSS and some fonts can block rendering until they are loaded.
• Code errors: infinite loops or errors in JavaScript can halt the rendering process.

Optimization includes asynchronous script loading, minimization and compression of resources, use of CDN, and caching.