How can I speed up development builds while developing a linked package? (Ember/Broccoli)

My Broccoli builds take up a LOT of time. ~30 seconds to build every time I change a line of js (I mean the incremental re-builds with dev server running, NOT a complete build).

Here's my situation. I have project A which is an ember addon to project B which I npm link in. As I'm developing project A, I am running ember server on project B.

EVERY SINGLE TIME that I make a change to a line of javascript in project A and rebuild, I see that the following files change in project B:

B/dist/assets/vendor.css B/dist/assets/vendor.js B/dist/assets/vendor.map B/dist/assets/B.css B/dist/assets/B.css.map 

My concern is that, because I'm developing a linked package, my broccoli configuration is such that the entire node_modules is recombined into those vendor files.

Is there a way for me to configure ember/broccoli to use a separate file to compile A into and segregate it from the rest of vendor.js? B/dist/assets/A.min.css and B/dist/assets/A.min.js for example?

...or I'm a guessing at the cause of the problem incorrectly?

Thank you so much for your help in advance!

Edit: Here's some extra info as requested

Slowest Nodes (totalTime => 5% ) | Total (avg) ----------------------------------------------+--------------------- Concat (11) | 39239ms (3567 ms) RecastFilter (280) | 33127ms (118 ms) Babel (233) | 14099ms (60 ms) EslintValidationFilter (5) | 12632ms (2526 ms) LessCompiler (46) | 7191ms (156 ms) Slowest Nodes (totalTime => 5% ) | Total (avg) ----------------------------------------------+--------------------- SourceMapConcat: Concat: Vendor /asset... (1) | 36270ms LessCompiler (46) | 4029ms (87 ms) 

Here's the index.js (Of project A):

const EngineAddon = require('ember-engines/lib/engine-addon'); const TreeMerger = require('broccoli-merge-trees'); const LessCompiler = require('broccoli-less-single'); const Funnel = require('broccoli-funnel'); const path = require('path'); module.exports = EngineAddon.extend({ name: 'ember-engine-admin-ui', lazyLoading: false, treeForVendor(tree) { let addonTree = this.treeGenerator(path.resolve(this.root, this.options.trees.addon)); let compiledLessTree = new LessCompiler(addonTree, 'styles/addon.less', `styles/${this.name}.css`); let sidebarCSSTree = new Funnel(path.dirname(require.resolve('sidebar-v2/css/leaflet-sidebar.css')), { files: ['leaflet-sidebar.css'], destDir: 'styles' }); let sidebarJSTree = new Funnel(path.dirname(require.resolve('sidebar-v2/js/leaflet-sidebar.js')), { files: ['leaflet-sidebar.js'], destDir: 'js' }); return new TreeMerger([tree, compiledLessTree, sidebarCSSTree, sidebarJSTree]); }, included() { this._super.included.apply(this, arguments); this.import(`vendor/styles/${this.name}.css`); this.import('vendor/js/leaflet-sidebar.js'); this.import('vendor/styles/leaflet-sidebar.css'); }, isDevelopingAddon() { return true; } });