RequireJS Optimizer - Only combine require lib and main.js

Question

My build step for my RequireJS project is taking too long (about 14s) to combine all my modules and export to a single file. This means developing while watching my files has become extremely tedious. I'm using the node module to compile and I've already tried all the tips on the RequireJS Optimizations page (including setting optimize to none), and haven't seen any significant difference in compile time. At this point, all I want to do is combine the require lib, the config, and the main.js starting file, so that all the other modules can be loaded through network requests.

I've thought about switching to Browserify or Webpack, but I haven't found any real proof that they will be faster solutions.

EDIT: My build config is below:

{
    baseUrl: 'js/',

    name: 'requireLib',

    paths:  {...paths},

    shim: {...shims},

    optimize: 'none'
}