Choose two optimization approaches that are useful for performance optimization:

Asynchronous requests improve performance by allowing the browser to load multiple resources simultaneously without blocking the rendering of the page. This reduces perceived load time and enhances user experience. Proper compression and metadata removal for images significantly reduces file sizes, leading to faster download times and less bandwidth consumption. Avoiding modern formats like WebP is incorrect because WebP offers superior compression and quality compared to older formats like JPEG or PNG, making it beneficial for performance. Increasing the number of CSS files per URL is also incorrect, as it generally leads to more HTTP requests, which can slow down page loading due to increased overhead.