diff --git a/src/public/javascripts/note_editor.js b/src/public/javascripts/note_editor.js
index 98bc9aa84..eca919fb7 100644
--- a/src/public/javascripts/note_editor.js
+++ b/src/public/javascripts/note_editor.js
@@ -217,7 +217,7 @@ const noteEditor = (function() {
         if (currentNote.detail.type === 'render') {
             $noteDetailRender.show();
 
-            const subTree = await server.get('script/subtree/' + getCurrentNoteId());
+            const subTree = await server.get('script/render/' + getCurrentNoteId());
 
             $noteDetailRender.html(subTree);
         }
diff --git a/src/routes/api/script.js b/src/routes/api/script.js
index 3d88d2c70..4306e3626 100644
--- a/src/routes/api/script.js
+++ b/src/routes/api/script.js
@@ -44,4 +44,11 @@ router.get('/subtree/:noteId', auth.checkApiAuth, wrap(async (req, res, next) =>
     res.send(await script.getNoteScript(note, repository));
 }));
 
+router.get('/render/:noteId', auth.checkApiAuth, wrap(async (req, res, next) => {
+    const repository = new Repository(req);
+    const note = await repository.getNote(req.params.noteId);
+
+    res.send(await script.getRenderScript(note, repository));
+}));
+
 module.exports = router;
\ No newline at end of file
diff --git a/src/services/scheduler.js b/src/services/scheduler.js
index 048501307..b256615eb 100644
--- a/src/services/scheduler.js
+++ b/src/services/scheduler.js
@@ -19,7 +19,7 @@ async function runNotesWithAttribute(runAttrValue) {
     }
 }
 
-setTimeout(() => runNotesWithAttribute('backend_startup'), 10 * 1000);
+setTimeout(() => runNotesWithAttribute('backend_startup'), 1 * 1000);
 
 setInterval(() => runNotesWithAttribute('hourly'), 3600 * 1000);
 
diff --git a/src/services/script.js b/src/services/script.js
index 6bbb44263..a403b0a8d 100644
--- a/src/services/script.js
+++ b/src/services/script.js
@@ -7,9 +7,20 @@ async function executeNote(note) {
     }
 
     const manualTransactionHandling = (await note.getAttributeMap()).manual_transaction_handling !== undefined;
-    const noteScript = await getNoteScript(note);
 
-    return await executeJob(noteScript, [], manualTransactionHandling);
+    const modules = await getModules([note], []);
+
+    // last \r\n is necessary if script contains line comment on its last line
+    const script = "async function() {\r\n" + modules.script + "\r\n}";
+
+    const ctx = new ScriptContext(null, note, module.allModules);
+
+    if (manualTransactionHandling) {
+        return await execute(ctx, script, '');
+    }
+    else {
+        return await sql.doInTransaction(async () => execute(ctx, script, ''));
+    }
 }
 
 async function executeScript(dataKey, script, params) {
@@ -20,7 +31,9 @@ async function executeScript(dataKey, script, params) {
 }
 
 async function execute(ctx, script, paramsStr) {
-    return await (function() { return eval(`const api = this; (${script})(${paramsStr})`); }.call(ctx));
+    console.log(`const api = this; (${script})(${paramsStr})`);
+
+    return await (function() { return eval(`const api = this;\r\n(${script})(${paramsStr})`); }.call(ctx));
 }
 
 const timeouts = {};
@@ -83,38 +96,64 @@ function getParams(params) {
     }).join(",");
 }
 
-async function getNoteScript(note) {
-    const subTreeScripts = await getSubTreeScripts(note, [note.noteId]);
+async function getRenderScript(note) {
+    const subTreeScripts = await getModules(note, [note.noteId]);
 
     // last \r\n is necessary if script contains line comment on its last line
     return "async function() {" + subTreeScripts + note.content + "\r\n}";
 }
 
+async function getNoteScript(note) {
+
+}
+
 /**
  * @param includedNoteIds - if multiple child note scripts reference same dependency (child note),
  *                          it will be included just once
  */
-async function getSubTreeScripts(parent, includedNoteIds) {
-    let script = "\r\n";
+async function getModules(children, includedNoteIds) {
+    const modules = [];
+    let allModules = [];
+    let script = '';
 
-    for (const child of await parent.getChildren()) {
-        if (!child.isJavaScript() || includedNoteIds.includes(child.noteId)) {
+    for (const child of children) {
+        if (!child.isJavaScript()) {
+            continue;
+        }
+
+        modules.push(child);
+
+        if (includedNoteIds.includes(child.noteId)) {
             continue;
         }
 
         includedNoteIds.push(child.noteId);
 
-        script += await getSubTreeScripts(child.noteId, includedNoteIds);
+        const children = await getModules(await child.getChildren(), includedNoteIds);
 
-        script += child.content + "\r\n";
+        allModules = allModules.concat(children.allModules);
+
+        script += children.script;
+
+        script += `
+api.__modules['${child.noteId}'] = {};
+await (async function(module, api, startNote, currentNote` + (children.modules.length > 0 ? ', ' : '') +
+        children.modules.map(child => child.title).join(', ') + `) {
+${child.content}
+})(api.__modules['${child.noteId}'], api, api.__startNote, api.__notes['${child.noteId}']` + (children.modules.length > 0 ? ', ' : '') +
+        children.modules.map(child => `api.__modules['${child.noteId}'].exports`).join(', ') + `);
+`;
     }
 
-    return script;
+    allModules = allModules.concat(modules);
+
+    return { script, modules, allModules };
 }
 
 module.exports = {
     executeNote,
     executeScript,
     setJob,
-    getNoteScript
+    getNoteScript,
+    getRenderScript
 };
\ No newline at end of file
diff --git a/src/services/script_context.js b/src/services/script_context.js
index 8a5ddcc07..5305c0e97 100644
--- a/src/services/script_context.js
+++ b/src/services/script_context.js
@@ -9,12 +9,21 @@ const config = require('./config');
 const Repository = require('./repository');
 const axios = require('axios');
 
-function ScriptContext(dataKey) {
+function ScriptContext(dataKey, note, allNotes) {
     dataKey = protected_session.getDataKey(dataKey);
     const repository = new Repository(dataKey);
 
     this.axios = axios;
 
+    this.__startNote = note;
+    this.__notes = {};
+
+    if (allNotes) {
+        allNotes.forEach(note => this.__notes[note.noteId] = note);
+    }
+
+    this.__modules = {};
+
     this.utils = {
         unescapeHtml: utils.unescapeHtml,
         isoDateTimeStr: utils.dateStr