diff --git a/packages/core/src/code-loading/webRequire.js b/packages/core/src/code-loading/webRequire.js
index cb1c33c86..d4e1bb3ab 100644
--- a/packages/core/src/code-loading/webRequire.js
+++ b/packages/core/src/code-loading/webRequire.js
@@ -72,6 +72,7 @@ const makeWebRequire = (filesAndFolders, options) => {
   // console.log('*****\n',filesAndFolders,'\n*****')
 
   const extensions = {}
+  const moduleCache = {}
 
   /* Require (obtain) the exports for the given require path, relative to the given current path.
    * The logic is based on the original NODE require() function.
@@ -105,6 +106,7 @@ const makeWebRequire = (filesAndFolders, options) => {
       if (entry.children) return null // directory
 
       if (extensions[baseExt]) {
+        if(moduleCache[requirePath]) return moduleCache[requirePath]
         // evaluate the content
         const matchingModule = {
           exports: {},
@@ -121,7 +123,7 @@ const makeWebRequire = (filesAndFolders, options) => {
           }
         }
         extensions[baseExt](matchingModule, entry.fullPath)
-        return matchingModule.exports
+        return moduleCache[requirePath] = matchingModule.exports
       }
       return null
     }
diff --git a/packages/core/src/code-loading/webRequire.test.js b/packages/core/src/code-loading/webRequire.test.js
index 422b8187a..599415fee 100644
--- a/packages/core/src/code-loading/webRequire.test.js
+++ b/packages/core/src/code-loading/webRequire.test.js
@@ -13,10 +13,14 @@ test('webRequire: should support require, from a single file', (t) => {
 
   let requireFn = makeWebRequire(singleFileJs, { apiMainPath })
   let designRootModule = requireFn(singleFileJs[0].fullPath)
+  const designRootModule2 = requireFn(singleFileJs[0].fullPath)
 
   t.true('main' in designRootModule)
   t.true(designRootModule.main instanceof Function)
 
+  t.is(designRootModule, designRootModule2)
+  t.deepEqual(designRootModule, designRootModule2)
+
   // NOTE: 'jscad' must be registered as an extension
   const fakeFs = makeFakeFs(singleFileJscad)
   requireFn = makeWebRequire(singleFileJscad, { apiMainPath })
@@ -32,7 +36,6 @@ test('webRequire: should support require, from a directory with index.js', (t) =
 
   const requireFn = makeWebRequire(directoryWithIndexJs, { apiMainPath })
   const designRootModule = requireFn('/project')
-
   t.true('main' in designRootModule)
   t.true(designRootModule.main instanceof Function)
 })