Server start-up takes too long to boot up.

I am facing pretty long build times on development mode, around 50-70 seconds.

I could narrow it down to notice that babel-register and babel-polyfill being required takes way too long to execute even a console statement at the start of server.js file. Any suggestions to speed up this process ? Also, i have replaced cssnext with a less loader along with post-css, but i'm guessing that shouldn't be the cause for the performance hit at server side transpiling since i have fewer .less files.

P.S.
I am running npm@3.9.6,, was thinking may be it was related to [this](https://www.reddit.com/r/javascript/comments/3u7gob/babels_poor_performance_what_im_doing_wrong/) post, but doesn't help.

Start at server.js and inspect where babel-register and babel-polyfill are required, then compare startup timing around those imports. Review the reported cssnext, less loader, and post-css configuration and reproduce the development-mode build with npm@3.9.6. Done means identifying the startup bottleneck and documenting or implementing a verified reduction in boot time.

Written by the indexing model from the issue text.