what is the js file

Hi,
Kindly send me a link to your site.

here: https://lp.lucienemartins.com.br/pos-lipo-de-papada/

i also would like to remove from js optimizations the section with the countdown at the end

Looking at your site, you are an Elementor Pro user. The developer can’t have a conversation with customers here. That’s not permitted for anyone.

For pro or commercial product support please contact the developer directly on their site. This includes any pre-sales topics as well.

https://my.elementor.com/

As the developer is aware, commercial products are not supported in these forums. I am sure they will have no problem supporting you there.