How to set up the import of styles from Bootstrap to Gulp?

Question

Bootstrap

Hello. The essence of the problem. When overriding Bootstrap styles, my task of compiling scss to Gulp can take 3 to 5 seconds. And it doesn't matter what file I'm working in - it takes a long time to compile (either I write my own styles separately, or I override some Bootstrap variables).
I solved a similar problem by creating 2 separate tasks in Gulp: one for working directly with Bootstrap (redefining variables - up to 1.5 s), the second task for working with other style files (up to 0.5 s). The output is 2 files: libs.min.css and style.min.css.
Question: does everyone have such a long compilation of bootstrap files, or is it just me that "smartly" set up my assembly? And are there any tips for a proper and optimized setup?
PS I did the import of bootstrap files as in the documentation (only the necessary ones), scss architecture: 7-1 .
Connection and work with bootstrap-files takes place in a separate folder vendors + add. files to override styles.

Thank you.