How does Auto Minify, Mirage & Prefetch URLs work under the hood?

Website, Application, Performance
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Could someone please explain to me in more detail exactly what is happening under the hood when we turn on the following settings below? I have read available docs but I need more in depth information please.

Auto Minify

So for auto minifying JS, HTML, CSS - when we enable this feature, what is exactly happening in the background? What does it do to our code and files? How is the Cloudflare auto minifying different to others? If we are already minifying code (such as with NextJS) - what impact does enabling this feature have?

Prefetch URLs

For prefetch URLs - what is it doing exactly under the hood when we enable this feature?

Mirage

And for mirage, again when we enable this feature what exactly is happening behind the scenes with our images?

Thank you!

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