diff --git a/lib/build/bundle.js b/lib/build/bundle.js
index ea1edea63..b9928e386 100644
--- a/lib/build/bundle.js
+++ b/lib/build/bundle.js
@@ -307,7 +307,7 @@ exports.Bundle = class {
         if (buildOptions.isApplicable('rev')) {
           //Generate a unique hash based off of the bundle contents
           //Must generate hash after we write the loader config so that any other bundle changes (hash changes) can cause a new hash for the vendor file
-          this.hash = generateHash(concat.content);
+          this.hash = generateHash(concat.content).slice(0, 10);
           bundleFileName = generateHashedPath(this.config.name, this.hash);
         }
 
@@ -319,7 +319,7 @@ exports.Bundle = class {
       } else if (buildOptions.isApplicable('rev')) {
         //Generate a unique hash based off of the bundle contents
         //Must generate hash after we write the loader config so that any other bundle changes (hash changes) can cause a new hash for the vendor file
-        this.hash = generateHash(concat.content);
+        this.hash = generateHash(concat.content).slice(0, 10);
         bundleFileName = generateHashedPath(this.config.name, this.hash);
       }
 
diff --git a/lib/build/bundled-source.js b/lib/build/bundled-source.js
index 0df41aead..243634a99 100644
--- a/lib/build/bundled-source.js
+++ b/lib/build/bundled-source.js
@@ -4,7 +4,7 @@ const findDeps = require('./find-deps').findDeps;
 const cjsTransform = require('./amodro-trace/read/cjs');
 const esTransform = require('./amodro-trace/read/es');
 const allWriteTransforms = require('./amodro-trace/write/all');
-const {moduleIdWithPlugin} = require('./utils');
+const Utils = require('./utils');
 const logger = require('aurelia-logging').getLogger('BundledSource');
 
 exports.BundledSource = class {
@@ -58,6 +58,10 @@ exports.BundledSource = class {
     return this.bundler.loaderConfig;
   }
 
+  _getUseCache() {
+    return this.bundler.buildOptions.isApplicable('cache');
+  }
+
   get moduleId() {
     if (this._moduleId) return this._moduleId;
 
@@ -123,27 +127,9 @@ exports.BundledSource = class {
       // support Node.js's json module
       let contents = `define(\'${moduleId}\',[],function(){return JSON.parse(${JSON.stringify(this.contents)});});\n`;
       // be nice to requirejs json plugin users, add json! prefix
-      contents += `define(\'${moduleIdWithPlugin(moduleId, 'json', loaderType)}\',[\'${moduleId}\'],function(m){return m;});\n`;
+      contents += `define(\'${Utils.moduleIdWithPlugin(moduleId, 'json', loaderType)}\',[\'${moduleId}\'],function(m){return m;});\n`;
       this.contents = contents;
     } else {
-      // forceCjsWrap bypasses a r.js parse bug.
-      // See lib/amodro-trace/read/cjs.js for more info.
-      let forceCjsWrap = !!modulePath.match(/\/(cjs|commonjs)\//i);
-      let contents;
-
-      try {
-        contents = cjsTransform(modulePath, this.contents, forceCjsWrap);
-      } catch (ignore) {
-        // file is not in amd/cjs format, try native es module
-        try {
-          contents = esTransform(modulePath, this.contents);
-        } catch (e) {
-          logger.error('Could not convert to AMD module, skipping ' + modulePath);
-          logger.error('Error was: ' + e);
-          contents = this.contents;
-        }
-      }
-
       deps = [];
 
       let context = {pkgsMainMap: {}, config: {shim: {}}};
@@ -197,24 +183,72 @@ exports.BundledSource = class {
         }
       }
 
-      const writeTransform = allWriteTransforms({
+      const opts = {
         stubModules: loaderConfig.stubModules,
         wrapShim: wrapShim || loaderConfig.wrapShim,
         replacement: replacement
-      });
+      };
+
+      // Use cache for js files to avoid expensive parsing and transform.
+      let cache;
+      let hash;
+      const useCache = this._getUseCache();
+      if (useCache) {
+        // Only hash on moduleId, opts and contents.
+        // This ensures cache on npm packages can be shared
+        // among different apps.
+        const key = [
+          moduleId,
+          JSON.stringify(context),
+          JSON.stringify(opts),
+          this.contents // contents here is after gulp transpile task
+        ].join('|');
+        hash = Utils.generateHash(key);
+        cache = Utils.getCache(hash);
+      }
 
-      contents = writeTransform(context, moduleId, modulePath, contents);
+      if (cache) {
+        this.contents = cache.contents;
+        deps = cache.deps;
+      } else {
+        let contents;
+        // forceCjsWrap bypasses a r.js parse bug.
+        // See lib/amodro-trace/read/cjs.js for more info.
+        let forceCjsWrap = !!modulePath.match(/\/(cjs|commonjs)\//i);
 
-      const tracedDeps = findDeps(modulePath, contents);
-      if (tracedDeps && tracedDeps.length) {
-        deps.push.apply(deps, tracedDeps);
+        try {
+          contents = cjsTransform(modulePath, this.contents, forceCjsWrap);
+        } catch (ignore) {
+          // file is not in amd/cjs format, try native es module
+          try {
+            contents = esTransform(modulePath, this.contents);
+          } catch (e) {
+            logger.error('Could not convert to AMD module, skipping ' + modulePath);
+            logger.error('Error was: ' + e);
+            contents = this.contents;
+          }
+        }
+
+        const writeTransform = allWriteTransforms(opts);
+        contents = writeTransform(context, moduleId, modulePath, contents);
+
+        const tracedDeps = findDeps(modulePath, contents);
+        if (tracedDeps && tracedDeps.length) {
+          deps.push.apply(deps, tracedDeps);
+        }
+        this.contents = contents;
+
+        // write cache
+        if (useCache && hash) {
+          Utils.setCache(hash, {
+            deps: deps,
+            contents: this.contents
+          });
+        }
       }
-      this.contents = contents;
     }
 
     this.requiresTransform = false;
-
-    // return deps
     if (!deps || deps.length === 0) return;
 
     let moduleIds = Array.from(new Set(deps)) // unique
diff --git a/lib/build/index.js b/lib/build/index.js
index 92c3fc169..e96a11e30 100644
--- a/lib/build/index.js
+++ b/lib/build/index.js
@@ -2,6 +2,8 @@
 const Bundler = require('./bundler').Bundler;
 const PackageAnalyzer = require('./package-analyzer').PackageAnalyzer;
 const PackageInstaller = require('./package-installer').PackageInstaller;
+const cacheDir = require('./utils').cacheDir;
+const del = require('del');
 
 let bundler;
 let project;
@@ -55,6 +57,11 @@ exports.dest = function(opts) {
     .then(() => bundler.write());
 };
 
+exports.clearCache = function() {
+  // delete cache folder outside of cwd
+  return del(cacheDir, {force: true});
+};
+
 function buildLoaderConfig(p) {
   project = p || project;
   through = require('through2'); //dep of vinyl-fs
diff --git a/lib/build/utils.js b/lib/build/utils.js
index 64c96f7f0..f7951d55d 100644
--- a/lib/build/utils.js
+++ b/lib/build/utils.js
@@ -2,6 +2,7 @@
 const path = require('path');
 const crypto = require('crypto');
 const fs = require('../file-system');
+const tmpDir = require('os').tmpdir();
 
 exports.knownExtensions = ['.js', '.json', '.css', '.svg', '.html'];
 
@@ -38,14 +39,28 @@ exports.moduleIdWithPlugin = function(moduleId, pluginName, type) {
   }
 };
 
-exports.generateBundleName = function(contents, fileName, rev) {
-  let hash;
-  if (rev === true) {
-    hash = exports.generateHash(new Buffer(contents, 'utf-8'));
-  } else {
-    hash = rev;
+const CACHE_DIR = path.resolve(tmpDir, 'aurelia-cli-cache');
+exports.cacheDir = CACHE_DIR;
+
+function cachedFilePath(hash) {
+  const folder = hash.substr(0, 2);
+  const fileName = hash.substr(2);
+  return path.resolve(CACHE_DIR, folder, fileName);
+}
+
+exports.getCache = function(hash) {
+  const filePath = cachedFilePath(hash);
+  try {
+    return JSON.parse(fs.readFileSync(filePath));
+  } catch (e) {
+    // ignore
   }
-  return rev ? exports.generateHashedPath(fileName, hash) : fileName;
+};
+
+exports.setCache = function(hash, object) {
+  const filePath = cachedFilePath(hash);
+  // async write
+  fs.writeFile(filePath, JSON.stringify(object));
 };
 
 exports.runSequentially = function(tasks, cb) {
@@ -85,11 +100,8 @@ exports.revertHashedPath = function(pth, hash) {
   });
 };
 
-exports.generateHash = function(buf) {
-  if (!Buffer.isBuffer(buf)) {
-    throw new TypeError('Expected a buffer');
-  }
-  return crypto.createHash('md5').update(buf).digest('hex').slice(0, 10);
+exports.generateHash = function(bufOrStr) {
+  return crypto.createHash('md5').update(bufOrStr).digest('hex');
 };
 
 exports.escapeForRegex = function(str) {
diff --git a/lib/commands/new/buildsystems/cli/index.js b/lib/commands/new/buildsystems/cli/index.js
index 6efddde14..efc3f98b9 100644
--- a/lib/commands/new/buildsystems/cli/index.js
+++ b/lib/commands/new/buildsystems/cli/index.js
@@ -40,7 +40,9 @@ module.exports = function(project, options) {
     ],
     options: {
       minify: 'stage & prod',
-      sourcemaps: 'dev & stage'
+      sourcemaps: 'dev & stage',
+      rev: false,
+      cache: 'dev & stage'
     },
     bundles: [
       {
@@ -106,6 +108,8 @@ module.exports = function(project, options) {
   ).addToTasks(
     ProjectItem.resource('build.ext', 'tasks/build.ext', model.transpiler),
     ProjectItem.resource('build.json', 'tasks/build.json'),
+    ProjectItem.resource('clear-cache.ext', 'tasks/clear-cache.ext', model.transpiler),
+    ProjectItem.resource('clear-cache.json', 'tasks/clear-cache.json'),
     ProjectItem.resource('copy-files.ext', 'tasks/copy-files.ext', model.transpiler),
     ProjectItem.resource('run.ext', 'tasks/run.ext', model.transpiler),
     ProjectItem.resource('run.json', 'tasks/run.json'),
diff --git a/lib/commands/new/buildsystems/cli/transpilers/babel.js b/lib/commands/new/buildsystems/cli/transpilers/babel.js
index a147ac2c1..6e1df5f7f 100644
--- a/lib/commands/new/buildsystems/cli/transpilers/babel.js
+++ b/lib/commands/new/buildsystems/cli/transpilers/babel.js
@@ -25,6 +25,7 @@ module.exports = function(project) {
     'babel-polyfill',
     'babel-register',
     'gulp-babel',
+    'gulp-cache',
     'gulp-eslint'
   );
 };
diff --git a/lib/dependencies.json b/lib/dependencies.json
index f5b868733..4b3e1e99b 100644
--- a/lib/dependencies.json
+++ b/lib/dependencies.json
@@ -44,6 +44,7 @@
   "file-loader": "^1.1.11",
   "gulp": "^4.0.0",
   "gulp-babel": "^7.0.1",
+  "gulp-cache": "^1.0.2",
   "gulp-changed-in-place": "^2.3.0",
   "gulp-eslint": "^4.0.2",
   "gulp-htmlmin": "^4.0.0",
diff --git a/lib/resources/tasks/clear-cache.js b/lib/resources/tasks/clear-cache.js
new file mode 100644
index 000000000..3ae04376c
--- /dev/null
+++ b/lib/resources/tasks/clear-cache.js
@@ -0,0 +1,16 @@
+import gulp from 'gulp';
+import {build} from 'aurelia-cli';
+import cache from 'gulp-cache';
+
+function clearTraceCache() {
+  return build.clearCache();
+}
+
+function clearTranspileCache() {
+  return cache.clearAll();
+}
+
+export default gulp.series(
+  clearTraceCache,
+  clearTranspileCache
+);
diff --git a/lib/resources/tasks/clear-cache.json b/lib/resources/tasks/clear-cache.json
new file mode 100644
index 000000000..4529ae970
--- /dev/null
+++ b/lib/resources/tasks/clear-cache.json
@@ -0,0 +1,4 @@
+{
+  "name": "clear-cache",
+  "description": "Clear both transpile cache (only for esnext), and tracing-cache (for CLI built-in tracer)."
+}
diff --git a/lib/resources/tasks/clear-cache.ts b/lib/resources/tasks/clear-cache.ts
new file mode 100644
index 000000000..b4644d92b
--- /dev/null
+++ b/lib/resources/tasks/clear-cache.ts
@@ -0,0 +1,6 @@
+import * as gulp from 'gulp';
+import {build} from 'aurelia-cli';
+
+export default function clearCache() {
+  return build.clearCache();
+}
diff --git a/lib/resources/tasks/transpile.js b/lib/resources/tasks/transpile.js
index 3c5df7305..cade90e1f 100644
--- a/lib/resources/tasks/transpile.js
+++ b/lib/resources/tasks/transpile.js
@@ -5,12 +5,15 @@ import babel from 'gulp-babel';
 import sourcemaps from 'gulp-sourcemaps';
 import notify from 'gulp-notify';
 import rename from 'gulp-rename';
+import cache from 'gulp-cache';
 import project from '../aurelia.json';
-import {CLIOptions, build} from 'aurelia-cli';
+import {CLIOptions, build, Configuration} from 'aurelia-cli';
 
-function configureEnvironment() {
-  let env = CLIOptions.getEnvironment();
+let env = CLIOptions.getEnvironment();
+const buildOptions = new Configuration(project.build.options);
+const useCache = buildOptions.isApplicable('cache');
 
+function configureEnvironment() {
   return gulp.src(`aurelia_project/environments/${env}.js`)
     .pipe(changedInPlace({firstPass: true}))
     .pipe(rename('environment.js'))
@@ -18,11 +21,18 @@ function configureEnvironment() {
 }
 
 function buildJavaScript() {
+  let transpile = babel(project.transpiler.options);
+  if (useCache) {
+    // the cache directory is "gulp-cache/projName-env" inside folder require('os').tmpdir()
+    // use command 'au clear-cache' to purge all caches
+    transpile = cache(transpile, {name: project.name + '-' + env});
+  }
+
   return gulp.src(project.transpiler.source)
     .pipe(plumber({errorHandler: notify.onError('Error: <%= error.message %>')}))
     .pipe(changedInPlace({firstPass: true}))
     .pipe(sourcemaps.init())
-    .pipe(babel(project.transpiler.options))
+    .pipe(transpile)
     .pipe(build.bundle());
 }
 
diff --git a/package-lock.json b/package-lock.json
index 7bc93891d..c85bd05df 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "aurelia-cli",
-  "version": "0.33.1",
+  "version": "0.34.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
     "@babel/code-frame": {
       "version": "7.0.0-beta.44",
-      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.0.0-beta.44.tgz",
+      "resolved": "http://registry.npmjs.org/@babel/code-frame/-/code-frame-7.0.0-beta.44.tgz",
       "integrity": "sha512-cuAuTTIQ9RqcFRJ/Y8PvTh+paepNcaGxwQwjIDRWPXmzzyAeCO4KqS9ikMvq0MCbRk6GlYKwfzStrcP3/jSL8g==",
       "dev": true,
       "requires": {
@@ -15,7 +15,7 @@
     },
     "@babel/generator": {
       "version": "7.0.0-beta.44",
-      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.0.0-beta.44.tgz",
+      "resolved": "http://registry.npmjs.org/@babel/generator/-/generator-7.0.0-beta.44.tgz",
       "integrity": "sha512-5xVb7hlhjGcdkKpMXgicAVgx8syK5VJz193k0i/0sLP6DzE6lRrU1K3B/rFefgdo9LPGMAOOOAWW4jycj07ShQ==",
       "dev": true,
       "requires": {
@@ -36,7 +36,7 @@
     },
     "@babel/helper-function-name": {
       "version": "7.0.0-beta.44",
-      "resolved": "https://registry.npmjs.org/@babel/helper-function-name/-/helper-function-name-7.0.0-beta.44.tgz",
+      "resolved": "http://registry.npmjs.org/@babel/helper-function-name/-/helper-function-name-7.0.0-beta.44.tgz",
       "integrity": "sha512-MHRG2qZMKMFaBavX0LWpfZ2e+hLloT++N7rfM3DYOMUOGCD8cVjqZpwiL8a0bOX3IYcQev1ruciT0gdFFRTxzg==",
       "dev": true,
       "requires": {
@@ -47,7 +47,7 @@
     },
     "@babel/helper-get-function-arity": {
       "version": "7.0.0-beta.44",
-      "resolved": "https://registry.npmjs.org/@babel/helper-get-function-arity/-/helper-get-function-arity-7.0.0-beta.44.tgz",
+      "resolved": "http://registry.npmjs.org/@babel/helper-get-function-arity/-/helper-get-function-arity-7.0.0-beta.44.tgz",
       "integrity": "sha512-w0YjWVwrM2HwP6/H3sEgrSQdkCaxppqFeJtAnB23pRiJB5E/O9Yp7JAAeWBl+gGEgmBFinnTyOv2RN7rcSmMiw==",
       "dev": true,
       "requires": {
@@ -56,7 +56,7 @@
     },
     "@babel/helper-split-export-declaration": {
       "version": "7.0.0-beta.44",
-      "resolved": "https://registry.npmjs.org/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.0.0-beta.44.tgz",
+      "resolved": "http://registry.npmjs.org/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.0.0-beta.44.tgz",
       "integrity": "sha512-aQ7QowtkgKKzPGf0j6u77kBMdUFVBKNHw2p/3HX/POt5/oz8ec5cs0GwlgM8Hz7ui5EwJnzyfRmkNF1Nx1N7aA==",
       "dev": true,
       "requires": {
@@ -65,7 +65,7 @@
     },
     "@babel/highlight": {
       "version": "7.0.0-beta.44",
-      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.0.0-beta.44.tgz",
+      "resolved": "http://registry.npmjs.org/@babel/highlight/-/highlight-7.0.0-beta.44.tgz",
       "integrity": "sha512-Il19yJvy7vMFm8AVAh6OZzaFoAd0hbkeMZiX3P5HGD+z7dyI7RzndHB0dg6Urh/VAFfHtpOIzDUSxmY6coyZWQ==",
       "dev": true,
       "requires": {
@@ -95,9 +95,9 @@
           }
         },
         "supports-color": {
-          "version": "5.4.0",
-          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.4.0.tgz",
-          "integrity": "sha512-zjaXglF5nnWpsq470jSv6P9DwPvgLkuapYmfDm3JWOm0vkNTVF2tI4UrN2r6jH1qM/uc/WtxYY1hYoA2dOKj5w==",
+          "version": "5.5.0",
+          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",
+          "integrity": "sha512-QjVjwdXIt408MIiAqCX4oUKsgU2EqAGzs2Ppkm4aQYbjm+ZEWEcW4SfFNTr4uMNZma0ey4f5lgLrkB0aX0QMow==",
           "dev": true,
           "requires": {
             "has-flag": "^3.0.0"
@@ -107,7 +107,7 @@
     },
     "@babel/template": {
       "version": "7.0.0-beta.44",
-      "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.0.0-beta.44.tgz",
+      "resolved": "http://registry.npmjs.org/@babel/template/-/template-7.0.0-beta.44.tgz",
       "integrity": "sha512-w750Sloq0UNifLx1rUqwfbnC6uSUk0mfwwgGRfdLiaUzfAOiH0tHJE6ILQIUi3KYkjiCDTskoIsnfqZvWLBDng==",
       "dev": true,
       "requires": {
@@ -119,7 +119,7 @@
       "dependencies": {
         "babylon": {
           "version": "7.0.0-beta.44",
-          "resolved": "https://registry.npmjs.org/babylon/-/babylon-7.0.0-beta.44.tgz",
+          "resolved": "http://registry.npmjs.org/babylon/-/babylon-7.0.0-beta.44.tgz",
           "integrity": "sha512-5Hlm13BJVAioCHpImtFqNOF2H3ieTOHd0fmFGMxOJ9jgeFqeAwsv3u5P5cR7CSeFrkgHsT19DgFJkHV0/Mcd8g==",
           "dev": true
         }
@@ -127,7 +127,7 @@
     },
     "@babel/traverse": {
       "version": "7.0.0-beta.44",
-      "resolved": "https://registry.npmjs.org/@babel/traverse/-/traverse-7.0.0-beta.44.tgz",
+      "resolved": "http://registry.npmjs.org/@babel/traverse/-/traverse-7.0.0-beta.44.tgz",
       "integrity": "sha512-UHuDz8ukQkJCDASKHf+oDt3FVUzFd+QYfuBIsiNu/4+/ix6pP/C+uQZJ6K1oEfbCMv/IKWbgDEh7fcsnIE5AtA==",
       "dev": true,
       "requires": {
@@ -145,7 +145,7 @@
       "dependencies": {
         "babylon": {
           "version": "7.0.0-beta.44",
-          "resolved": "https://registry.npmjs.org/babylon/-/babylon-7.0.0-beta.44.tgz",
+          "resolved": "http://registry.npmjs.org/babylon/-/babylon-7.0.0-beta.44.tgz",
           "integrity": "sha512-5Hlm13BJVAioCHpImtFqNOF2H3ieTOHd0fmFGMxOJ9jgeFqeAwsv3u5P5cR7CSeFrkgHsT19DgFJkHV0/Mcd8g==",
           "dev": true
         },
@@ -168,7 +168,7 @@
     },
     "@babel/types": {
       "version": "7.0.0-beta.44",
-      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.0.0-beta.44.tgz",
+      "resolved": "http://registry.npmjs.org/@babel/types/-/types-7.0.0-beta.44.tgz",
       "integrity": "sha512-5eTV4WRmqbaFM3v9gHAIljEQJU4Ssc6fxL61JN+Oe2ga/BwyjzjamwkCVVAQjHGuAX8i0BWo42dshL8eO5KfLQ==",
       "dev": true,
       "requires": {
@@ -192,9 +192,9 @@
       "dev": true
     },
     "JSONStream": {
-      "version": "1.3.3",
-      "resolved": "https://registry.npmjs.org/JSONStream/-/JSONStream-1.3.3.tgz",
-      "integrity": "sha512-3Sp6WZZ/lXl+nTDoGpGWHEpTnnC6X5fnkolYZR6nwIfzbxxvA8utPWe1gCt7i0m9uVGsSz2IS8K8mJ7HmlduMg==",
+      "version": "1.3.4",
+      "resolved": "https://registry.npmjs.org/JSONStream/-/JSONStream-1.3.4.tgz",
+      "integrity": "sha512-Y7vfi3I5oMOYIr+WxV8NZxDSwcbNgzdKYsTNInmycOq9bUYwGg9ryu57Wg5NLmCjqdFPNUmpMBo3kSJN9tCbXg==",
       "dev": true,
       "requires": {
         "jsonparse": "^1.2.0",
@@ -208,9 +208,9 @@
       "dev": true
     },
     "acorn": {
-      "version": "5.7.1",
-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.7.1.tgz",
-      "integrity": "sha512-d+nbxBUGKg7Arpsvbnlq61mc12ek3EY8EQldM3GPAhWJ1UVxC6TDGbIvUMNU6obBX3i1+ptCIzV4vq0gFPEGVQ==",
+      "version": "5.7.3",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.7.3.tgz",
+      "integrity": "sha512-T/zvzYRfbVojPWahDsE5evJdHb3oJoQfFbsrKM7w5Zcs++Tr257tia3BmMP8XYVjp1S9RZXQMh7gao96BlqZOw==",
       "dev": true
     },
     "acorn-jsx": {
@@ -238,15 +238,15 @@
       }
     },
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@@ -10032,6 +7783,14 @@
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@@ -10137,6 +7920,14 @@
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@@ -10327,6 +8111,21 @@
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@@ -10336,12 +8135,27 @@
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diff --git a/package.json b/package.json
index cf6cd553f..1d79f4872 100644
--- a/package.json
+++ b/package.json
@@ -36,6 +36,7 @@
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+    "del": "^3.0.0",
     "esprima": "^4.0.0",
     "glob": "^7.1.1",
     "gulp": "^4.0.0",
diff --git a/spec/lib/build/bundled-source.spec.js b/spec/lib/build/bundled-source.spec.js
index efa917205..5f128981c 100644
--- a/spec/lib/build/bundled-source.spec.js
+++ b/spec/lib/build/bundled-source.spec.js
@@ -2,6 +2,7 @@
 const path = require('path');
 const BundlerMock = require('../../mocks/bundler');
 const BundledSource = require('../../../lib/build/bundled-source').BundledSource;
+const Utils = require('../../../lib/build/utils');
 
 const cwd = process.cwd();
 
@@ -116,6 +117,7 @@ describe('the BundledSource module', () => {
         b8: 'foo/bar'
       }
     });
+    bs._getUseCache = () => undefined;
 
     let deps = bs.transform();
     expect(deps).toEqual(['lo/rem', 'foo.html']); // relative dep is ignored
@@ -140,6 +142,7 @@ describe('the BundledSource module', () => {
         shared: '../../shared'
       }
     });
+    bs._getUseCache = () => undefined;
 
     let deps = bs.transform();
     expect(deps).toEqual(['lo/rem']); // relative dep is ignored
@@ -148,7 +151,6 @@ describe('the BundledSource module', () => {
     expect(bundler.configTargetBundle.addAlias).toHaveBeenCalledWith('shared/bar/loo', '__dot_dot__/__dot_dot__/shared/bar/loo');
   });
 
-
   it('transforms local non-js file', () => {
     let file = {
       path: path.resolve(cwd, 'src/foo/bar.html'),
@@ -162,6 +164,7 @@ describe('the BundledSource module', () => {
       transform: (moduleId, modulePath, contents) => `define('${moduleId}',function(){return '${contents}';});`
     }];
     bs._getLoaderConfig = () => ({paths: {}});
+    bs._getUseCache = () => undefined;
 
     let deps = bs.transform();
     expect(deps).toEqual(['lo/rem.css']);
@@ -197,6 +200,7 @@ exports.t = t;
     };
     bs._getLoaderPlugins = () => [];
     bs._getLoaderConfig = () => ({paths: {}});
+    bs._getUseCache = () => undefined;
 
     let deps = bs.transform();
     expect(deps).toEqual(['foo/bar/t']);
@@ -232,6 +236,7 @@ export {t};
     };
     bs._getLoaderPlugins = () => [];
     bs._getLoaderConfig = () => ({paths: {}});
+    bs._getUseCache = () => undefined;
 
     let deps = bs.transform();
     expect(deps).toEqual(['foo/bar/t']);
@@ -263,6 +268,7 @@ export {t};
     };
     bs._getLoaderPlugins = () => [];
     bs._getLoaderConfig = () => ({paths: {}});
+    bs._getUseCache = () => undefined;
 
     let deps = bs.transform();
     expect(deps).toEqual(['a', 'b']);
@@ -295,6 +301,7 @@ export {t};
     };
     bs._getLoaderPlugins = () => [];
     bs._getLoaderConfig = () => ({paths: {}});
+    bs._getUseCache = () => undefined;
 
     let deps = bs.transform();
     expect(deps).toEqual(['a', 'b', 'c']);
@@ -328,6 +335,7 @@ export {t};
     };
     bs._getLoaderPlugins = () => [];
     bs._getLoaderConfig = () => ({paths: {}});
+    bs._getUseCache = () => undefined;
 
     let deps = bs.transform();
     expect(deps).toBeUndefined();
@@ -360,6 +368,7 @@ export {t};
     };
     bs._getLoaderPlugins = () => [];
     bs._getLoaderConfig = () => ({paths: {}});
+    bs._getUseCache = () => undefined;
 
     let deps = bs.transform();
     expect(deps).toBeUndefined();
@@ -395,6 +404,7 @@ export {t};
       transform: (moduleId, modulePath, contents) => `define('${moduleId}',function(){return '${contents}';});`
     }];
     bs._getLoaderConfig = () => ({paths: {}});
+    bs._getUseCache = () => undefined;
 
     let deps = bs.transform();
     expect(deps).toEqual(['foo/bar/a.css']);
@@ -429,6 +439,7 @@ export {t};
     };
     bs._getLoaderPlugins = () => [];
     bs._getLoaderConfig = () => ({paths: {}});
+    bs._getUseCache = () => undefined;
 
     let deps = bs.transform();
     expect(deps).toEqual(['bar']);
@@ -497,6 +508,7 @@ export {t};
     };
     bs._getLoaderPlugins = () => [];
     bs._getLoaderConfig = () => ({paths: {}});
+    bs._getUseCache = () => undefined;
 
     let deps = bs.transform();
     expect(deps).toEqual(['bar']);
@@ -531,6 +543,7 @@ export {t};
     };
     bs._getLoaderPlugins = () => [];
     bs._getLoaderConfig = () => ({paths: {}, wrapShim: true});
+    bs._getUseCache = () => undefined;
 
     let deps = bs.transform();
     expect(deps).toEqual(['bar']);
@@ -566,6 +579,7 @@ export {t};
     };
     bs._getLoaderPlugins = () => [];
     bs._getLoaderConfig = () => ({paths: {}});
+    bs._getUseCache = () => undefined;
 
     let deps = bs.transform();
     expect(deps).toEqual(['bar']);
@@ -599,6 +613,7 @@ export {t};
     };
     bs._getLoaderPlugins = () => [];
     bs._getLoaderConfig = () => ({paths: {}, wrapShim: true});
+    bs._getUseCache = () => undefined;
 
     let deps = bs.transform();
     expect(deps).toEqual(['bar']);
@@ -635,6 +650,7 @@ export {t};
     };
     bs._getLoaderPlugins = () => [];
     bs._getLoaderConfig = () => ({paths: {}});
+    bs._getUseCache = () => undefined;
 
     let deps = bs.transform();
     expect(deps).toEqual(['__ignore__', 'foo/shims/module/b', 'foo/bar', 'prebid.js', 'foo/shims/server-only']);
@@ -675,4 +691,105 @@ export {t};
     expect(bs.contents.replace(/\r|\n/g, ''))
       .toBe("define('foo/index',['require','exports','module','pack-name.js','@pack/name.js','pack-name.js/foo','@pack/name.js/foo','./bar'],function (require, exports, module) {require('pack-name.js'); require('@pack/name.js'); require('pack-name.js/foo'); require('@pack/name.js/foo'); require('./bar');});");
   });
+
+  describe('cache', () => {
+    let oldGetCache;
+    let oldSetCache;
+
+    beforeEach(() => {
+      oldGetCache = Utils.getCache;
+      oldSetCache = Utils.setCache;
+    });
+
+    afterEach(() => {
+      Utils.getCache = oldGetCache;
+      Utils.setCache = oldSetCache;
+    });
+
+    it('transform saves cache', () => {
+      let file = {
+        path: path.resolve(cwd, 'node_modules/foo/bar/lo.js'),
+        contents: "var t = require('./t');exports.t = t;"
+      };
+
+      Utils.getCache = jasmine.createSpy('getCache').and.returnValue(undefined);
+      Utils.setCache = jasmine.createSpy('setCache');
+
+      let bs = new BundledSource(bundler, file);
+      bs._getProjectRoot = () => 'src';
+      bs.includedBy = {
+        includedBy: {
+          description: {
+            name: 'foo',
+            mainId: 'foo/index',
+            loaderConfig: {
+              name: 'foo',
+              path: '../node_modules/foo',
+              main: 'index'
+            },
+            browserReplacement: () => undefined
+          }
+        }
+      };
+      bs._getLoaderPlugins = () => [];
+      bs._getLoaderConfig = () => ({paths: {}});
+      bs._getUseCache = () => true;
+
+      let deps = bs.transform();
+      let contents = "define('foo/bar/lo',['require','exports','module','./t'],function (require, exports, module) {var t = require('./t');exports.t = t;});";
+      expect(deps).toEqual(['foo/bar/t']);
+      expect(bs.requiresTransform).toBe(false);
+      expect(bs.contents.replace(/\r|\n/g, ''))
+        .toBe(contents);
+
+      expect(Utils.getCache).toHaveBeenCalled();
+      expect(Utils.setCache).toHaveBeenCalled();
+      expect(Utils.setCache.calls.argsFor(0)[1].deps).toEqual(['./t']);
+      expect(Utils.setCache.calls.argsFor(0)[1].contents.replace(/\r|\n/g, '')).toBe(contents);
+    });
+
+    it('transform uses cache', () => {
+      let file = {
+        path: path.resolve(cwd, 'node_modules/foo/bar/lo.js'),
+        contents: "var t = require('./t');exports.t = t;"
+      };
+
+      let contents = "define('foo/bar/lo',['require','exports','module','./t'],function (require, exports, module) {var t = require('./t');exports.t = t;});";
+
+      Utils.getCache = jasmine.createSpy('getCache').and.returnValue({
+        deps: ['./t'],
+        contents
+      });
+      Utils.setCache = jasmine.createSpy('setCache');
+
+      let bs = new BundledSource(bundler, file);
+      bs._getProjectRoot = () => 'src';
+      bs.includedBy = {
+        includedBy: {
+          description: {
+            name: 'foo',
+            mainId: 'foo/index',
+            loaderConfig: {
+              name: 'foo',
+              path: '../node_modules/foo',
+              main: 'index'
+            },
+            browserReplacement: () => undefined
+          }
+        }
+      };
+      bs._getLoaderPlugins = () => [];
+      bs._getLoaderConfig = () => ({paths: {}});
+      bs._getUseCache = () => true;
+
+      let deps = bs.transform();
+      expect(deps).toEqual(['foo/bar/t']);
+      expect(bs.requiresTransform).toBe(false);
+      expect(bs.contents.replace(/\r|\n/g, ''))
+        .toBe(contents);
+
+      expect(Utils.getCache).toHaveBeenCalled();
+      expect(Utils.setCache).not.toHaveBeenCalled();
+    });
+  });
 });
diff --git a/spec/lib/build/util.spec.js b/spec/lib/build/util.spec.js
index 6fac11705..f8f65a2c7 100644
--- a/spec/lib/build/util.spec.js
+++ b/spec/lib/build/util.spec.js
@@ -60,3 +60,18 @@ describe('the Utils.createSrcFileRegex function', () => {
     expect('<script src=scripts/app-bundle.js></script>'.match(Utils.createSrcFileRegex('scripts', 'vendor-bundle'))).toBeFalsy();
   });
 });
+
+describe('the Utils.moduleIdWithPlugin function', () => {
+  it('generates requirejs style module id', () => {
+    expect(Utils.moduleIdWithPlugin('foo/bar', 'plugin', 'require')).toBe('plugin!foo/bar');
+  });
+
+  it('generates systemjs style module id', () => {
+    expect(Utils.moduleIdWithPlugin('foo/bar', 'plugin', 'system')).toBe('foo/bar!plugin');
+  });
+
+  it('complains unknown type', () => {
+    expect(() => Utils.moduleIdWithPlugin('foo/bar', 'plugin', 'unknown')).toThrow();
+  });
+});
+
diff --git a/spec/mocks/bundler.js b/spec/mocks/bundler.js
index 7b7f572a6..f14bc52a4 100644
--- a/spec/mocks/bundler.js
+++ b/spec/mocks/bundler.js
@@ -25,5 +25,6 @@ module.exports = class Bundler {
         extensions: ['.html', '.css']
       })]
     };
+    this.environment = 'dev';
   }
 };