Page speed optimisation from a technical perspective for SEO purposes

I've got a website running on apache/php/mysql. (yes its wordpress). and I want to embark on improving the page speed loading.

I know from a technical perspective what I need to change to improve things. A few of the main ones are:

1) combine all css

2) combine all js

3) remove unused css and js

4) convert images to webp format

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I know when you're building a web application you can use tools like webpack to do these things at build time. But I'm trying to find a solution that can perform all this at run time, and cache the output of that.

So basically:

PHP/WP --> Apache --> webpack/compile code/cache tool -> Cloudfront --> WWW

Does anyone know of anything out there that does something like this? We're using AWS too if that helps.

I know that there's someone out there that is just itching to say "hey just install this WP plugin". which I'm not against doing if it matches my needs, but I at least need to know the mechanism behind how it works.