Grunt is amazing, but when developing on Windows I found my grunt tasks would take a while when working with a CSS preprocessor and grunt-watch.
According to the Github page, the
nospawn option can help speed things up, but may be prone to erroneous builds. The latter has not been a problem for over 500+ builds.
Onto the tip: In your gruntfile.js, where you have declared your watch object, add this:
nospawn: true. That's it, a sample config file and before and after screen is below. Happy grunting.
Before and after: