Which three techniques improve client-side performance in production while following documented best practices?

For improving client-side performance, several techniques are considered best practices:

Place CSS outside of templates (B): External CSS files can be cached by the browser, reducing the need to download them for every page load. This also separates content from style,

which aids in maintaining cleaner HTML and potentially speeds up page rendering times.

Compress CSS (C): Compressing CSS files reduces their size, leading to faster download times. This can be achieved through minification, which removes unnecessary characters from code without changing its functionality.

Combine several images into a single image (CSS sprites) (E): Using CSS sprites combines multiple images into one larger image that is downloaded as a single file. This reduces the number of HTTP requests needed for loading multiple images, thereby decreasing load times and improving performance.