Develop entirely on sage?

Hey guys.

I’m looking for a bit of guidance in how to code a website. Basically I have a PSD layout that I have to convert to a Wordpress Theme and I was thinking of doing the development entirely on sage. I have a problem, though. Last time I did this kind of process/development, at the end of the development, gulp would get reaaaally slow when processing CSS, I would wait 20 seconds for each css reload; this would hinder and slow the front-end development part if I follow this path.

Other option I have is installing a webapp with Yoeman, coding the front-end and then porting the code to sage, but I don’t know how to deal with the bower components and such when porting.