Sass or Css for the rails app

I am new to rails. i found Sass a real beauty to write CSS. My question
is that is there any efficency to use Sass for the project that minimize
the response time of the each request??

How can i submit the multiple form on a single request from the user.??

The deployed project is totally independent of whether we used SAAS at the time of development or not, because the deployed application will only have compiled CSS.

So if your concern is to optimize the code, try to optimize your selectors.

Precompile your S[AC]SS into CSS.

Thats the only way I am awara of.