Using Optimization Module

[arslandev123]

Considering we have a Breeze theme which is already an optimized theme. Do we still need to have a PageSpeed Optimization Module

which comes with
Css Optimization, HTML Optimization

More Specifically (JS Optimization, Images Optimization or Lazy Load feature by 3rd party modules like Mirasvit)

[vovayatsyuk]

CSS, HTML, and JS minification are built into magento. There is no need to install third-party modules.

Image lazyload: built-in images (listing, product page) are already lazyloaded. Don't forget to add loading="lazy" to your custom content.

Image optimization: check the image dimensions first. Usually, the main issue is the using of oversized images. When image dimensions are fine, then you can proceed with deeper optimizations (wepb, image quality).

I recommend optimizing the slowest parts of the site step by step. Run the test on https://pagespeed.web.dev/, enable "insights mode" and follow the recommendations.