diff --git a/tools/isobuild/js-analyze.js b/tools/isobuild/js-analyze.js
index 24bda2b580..5f2bf258b0 100644
--- a/tools/isobuild/js-analyze.js
+++ b/tools/isobuild/js-analyze.js
@@ -1,7 +1,7 @@
 import { parse } from '@meteorjs/babel';
 import { analyze as analyzeScope } from 'escope';
 import LRU from "lru-cache";
-
+import { Profile } from '../tool-env/profile';
 import Visitor from "@meteorjs/reify/lib/visitor.js";
 import { findPossibleIndexes } from "@meteorjs/reify/lib/utils.js";
 
@@ -26,9 +26,23 @@ function tryToParse(source, hash) {
   }
 
   let ast;
-
   try {
-    ast = parse(source);
+    Profile.time('jsAnalyze.parse', () => {
+      ast = parse(source, {
+        strictMode: false,
+        sourceType: 'module',
+        allowImportExportEverywhere: true,
+        allowReturnOutsideFunction: true,
+        allowUndeclaredExports: true,
+        plugins: [
+          // Only plugins for stage 3 features are enabled
+          // Enabling some plugins significantly affects parser performance
+          'importAttributes',
+          'explicitResourceManagement',
+          'decorators'
+        ]
+      });
+    });
   } catch (e) {
     if (typeof e.loc === 'object') {
       e.$ParseError = true;
@@ -71,7 +85,10 @@ export function findImportedModuleIdentifiers(source, hash) {
   }
 
   const ast = tryToParse(source, hash);
-  importedIdentifierVisitor.visit(ast, source, possibleIndexes);
+  Profile.time('findImportedModuleIdentifiersVisitor', () => {
+    importedIdentifierVisitor.visit(ast, source, possibleIndexes);
+  });
+
   return importedIdentifierVisitor.identifiers;
 }