I am also fronted developer and facing same problem, it's because of server side compilation mode.

Please try following method, may be it's helpful and you don't need grunt cmd also so it's save your time also

go to 

    store > Configuration > Advanced > Developer > Front-end development workflow 

and change workflow type to **Client side less compilation** 

Now go to your Magento installed directory and manually delete following folders

     1. pub\static\frontend\Magento  (remove all theme folders)

     2. var\ (remove all items)

now edit any less file and check it.

no need to run any **grunt CMD** direct Refresh your browser may be  it's working fine