diff --git a/packages/rekit-studio/middleware/taskRunner.js b/packages/rekit-studio/middleware/taskRunner.js
index a913839c..3f60f0a2 100644
--- a/packages/rekit-studio/middleware/taskRunner.js
+++ b/packages/rekit-studio/middleware/taskRunner.js
@@ -4,11 +4,16 @@
 
 const rekitCore = require('rekit-core');
 const spawn = require('child_process').spawn;
+const _ = require('lodash');
 
 function runTask(io, cmd, type, params) {
   console.log('running task: ', cmd);
   const prjRoot = rekitCore.utils.getProjectRoot();
   const args = cmd.split(' ');
+
+  // const doOutput = (data) => {
+
+  // }
   return new Promise((resolve) => {
     const child = spawn(args[0],
       args.splice(1),
@@ -18,23 +23,35 @@ function runTask(io, cmd, type, params) {
       }
     );
     child.stdout.pipe(process.stdout);
-    const handleOutput = (data) => {
-      // collect the data
-      const text = data.toString('utf8').replace(/ /g, ' ').split('\n');
 
-      const arr = [];
-      text.forEach(t => arr.push(t));
-      io.emit('output', {
+    const arr = [];
+    // Emit output at most every second
+    const emitOutput = _.throttle(() => {
+      if (arr.length > 0) io.emit('output', {
         type,
         id: params.id,
         params,
         output: arr,
       });
+      arr.length = 0;
+    }, 1000);
+    const handleOutput = (data) => {
+      // collect the data
+      const text = data.toString('utf8').replace(/ /g, ' ').split('\n');
+      arr.push.apply(arr, text);
+      emitOutput();
     };
     child.stdout.on('data', handleOutput);
     child.stderr.on('data', handleOutput);
 
     child.on('close', () => {
+      io.emit('output', {
+        type,
+        id: params.id,
+        params,
+        output: arr,
+      });
+      arr.length = 0;
       io.emit('task-finished', { type, params });
       resolve();
     });
diff --git a/packages/rekit-studio/package.json b/packages/rekit-studio/package.json
index 30ba7ebc..c8cb907c 100644
--- a/packages/rekit-studio/package.json
+++ b/packages/rekit-studio/package.json
@@ -136,7 +136,7 @@
     "estraverse-fb": "^1.3.1",
     "express": "^4.15.2",
     "express-history-api-fallback": "^2.0.0",
-    "file-loader": "^1.1.6",
+    "file-loader": "^1.1.11",
     "fuzzysort": "^1.1.1",
     "highlight.js": "^9.11.0",
     "immutability-helper": "^2.6.4",
diff --git a/yarn.lock b/yarn.lock
index eb314554..80855874 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -4431,6 +4431,13 @@ file-entry-cache@^2.0.0:
     flat-cache "^1.2.1"
     object-assign "^4.0.1"
 
+file-loader@^1.1.11:
+  version "1.1.11"
+  resolved "https://registry.yarnpkg.com/file-loader/-/file-loader-1.1.11.tgz#6fe886449b0f2a936e43cabaac0cdbfb369506f8"
+  dependencies:
+    loader-utils "^1.0.2"
+    schema-utils "^0.4.5"
+
 file-loader@^1.1.6:
   version "1.1.6"
   resolved "https://registry.yarnpkg.com/file-loader/-/file-loader-1.1.6.tgz#7b9a8f2c58f00a77fddf49e940f7ac978a3ea0e8"
@@ -9590,7 +9597,7 @@ schema-utils@^0.3.0:
   dependencies:
     ajv "^5.0.0"
 
-schema-utils@^0.4.0:
+schema-utils@^0.4.0, schema-utils@^0.4.5:
   version "0.4.5"
   resolved "https://registry.yarnpkg.com/schema-utils/-/schema-utils-0.4.5.tgz#21836f0608aac17b78f9e3e24daff14a5ca13a3e"
   dependencies: