diff --git a/lib/graph/slim_graph.js b/lib/graph/slim_graph.js
index 6ed630cb..db1d0d9a 100644
--- a/lib/graph/slim_graph.js
+++ b/lib/graph/slim_graph.js
@@ -1,9 +1,10 @@
+var omit = require("lodash/omit");
 var first = require("lodash/first");
 var negate = require("lodash/negate");
 var concat = require("lodash/concat");
+var assign = require("lodash/assign");
 var partial = require("lodash/partial");
 var includes = require("lodash/includes");
-var cloneDeep = require("lodash/cloneDeep");
 var isJavaScriptBundle = require("../bundle/is_js_bundle");
 var makeSlimShimNode = require("../node/make_slim_shim_node");
 var makeSlimBundleNode = require("../node/make_slim_bundle_node");
@@ -82,7 +83,7 @@ module.exports = function(options) {
 		var secondaryBundles = jsBundles.filter(negate(isEntryPointBundle));
 
 		// each entry point bundle includes the loader code
-		entryPointBundles.forEach(function(bundle) {
+		var slimmedEntryBundles = entryPointBundles.map(function(bundle) {
 			var mainName = getMainName(bundle);
 
 			var sharedBundles = getSharedBundlesOf(
@@ -92,10 +93,10 @@ module.exports = function(options) {
 				mainName
 			);
 
-			bundle.nodes = [
+			var nodes = [
 				slimConfigNode,
 				makeSlimShimNode({
-					nodes: bundle.nodes,
+					nodes: bundle.nodes.slice(0),
 					target: options.target,
 					sharedBundles: sharedBundles,
 					plugins: !!nonJsBundles.length,
@@ -105,10 +106,13 @@ module.exports = function(options) {
 				})
 			];
 
+			return assign({}, omit(bundle, ["nodes"]), {
+				nodes: nodes
+			});
 		});
 
 		slimmedBundles = concat(
-			entryPointBundles,
+			slimmedEntryBundles,
 			secondaryBundles.map(partial(toSlimBundle, options.target)),
 			nonJsBundles
 		);
@@ -143,9 +147,9 @@ function getSharedBundlesOf(bundles, mainName) {
 }
 
 function toSlimBundle(target, bundle) {
-	var cloned = cloneDeep(bundle);
-	cloned.nodes = [makeSlimBundleNode(target, cloned)];
-	return cloned;
+	return assign({}, omit(bundle, ["nodes"]), {
+		nodes: [makeSlimBundleNode(target, bundle)]
+	});
 }
 
 function makeLoaderBundle(nodes) {
diff --git a/lib/stream/slim.js b/lib/stream/slim.js
index eed1fa43..8123f0d6 100644
--- a/lib/stream/slim.js
+++ b/lib/stream/slim.js
@@ -26,7 +26,7 @@ module.exports = function(options) {
  * @return {Object} The mutated data
  */
 function doSlimGrap(data, options) {
-	var bundles = cloneDeep(data.bundles);
+	var bundles = data.bundles.slice(0);
 
 	var slimmedBundles = slimGraph({
 		graph: data.graph,