diff --git a/app/build.gradle b/app/build.gradle
index c0598ce2..78bba16f 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -9,8 +9,8 @@ android {
         applicationId "com.stardust.scriptdroid"
         minSdkVersion 19
         targetSdkVersion 23
-        versionCode 139
-        versionName "2.0.13 Alpha2"
+        versionCode 140
+        versionName "2.0.13 Alpha3"
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
         multiDexEnabled true
         ndk {
diff --git a/app/src/main/java/com/stardust/scriptdroid/sublime/SublimePluginClient.java b/app/src/main/java/com/stardust/scriptdroid/sublime/SublimePluginClient.java
index 2cac412b..a24768bd 100644
--- a/app/src/main/java/com/stardust/scriptdroid/sublime/SublimePluginClient.java
+++ b/app/src/main/java/com/stardust/scriptdroid/sublime/SublimePluginClient.java
@@ -13,6 +13,7 @@ import java.io.InputStreamReader;
 import java.io.OutputStream;
 import java.net.Socket;
 import java.util.concurrent.Executor;
+import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 
 /**
@@ -39,7 +40,7 @@ public class SublimePluginClient {
     private String host;
     private int port;
     private OutputStream mOutputStream;
-    private Executor mExecutor;
+    private ExecutorService mExecutor;
 
     public SublimePluginClient(String host, int port) {
         this.host = host;
@@ -105,8 +106,10 @@ public class SublimePluginClient {
     public void close() throws IOException {
         if (mSocket != null) {
             mSocket.close();
+            mExecutor.shutdownNow();
             mSocket = null;
             mOutputStream = null;
+            mExecutor = null;
             EventBus.getDefault().post(new ConnectionStateChangeEvent(false));
         }
     }
diff --git a/autojs/src/main/java/com/stardust/autojs/runtime/api/image/ScreenCapturer.java b/autojs/src/main/java/com/stardust/autojs/runtime/api/image/ScreenCapturer.java
index a1d3456c..7c1bc04d 100644
--- a/autojs/src/main/java/com/stardust/autojs/runtime/api/image/ScreenCapturer.java
+++ b/autojs/src/main/java/com/stardust/autojs/runtime/api/image/ScreenCapturer.java
@@ -13,23 +13,34 @@ import android.media.projection.MediaProjectionManager;
 import android.os.Build;
 import android.os.Looper;
 import android.support.annotation.RequiresApi;
+import android.util.Log;
+import android.widget.ImageView;
 
+import com.stardust.autojs.runtime.ScriptInterruptedException;
 import com.stardust.util.ScreenMetrics;
 
+import java.util.HashSet;
+import java.util.concurrent.ConcurrentHashMap;
+
 /**
  * Created by Stardust on 2017/5/17.
  */
 @RequiresApi(Build.VERSION_CODES.LOLLIPOP)
 public class ScreenCapturer {
 
+    private static final String LOG_TAG = "ScreenCapturer";
     private ImageReader mImageReader;
     private MediaProjection mMediaProjection;
     private VirtualDisplay mVirtualDisplay;
-    private Image mImage;
+    private volatile Looper mImageAcquireLooper;
+    private final Object mImageWaitingLock = new Object();
+    private volatile Image mImage;
+    private volatile Image mLatestImage;
 
     public ScreenCapturer(Context context, Intent data, int screenWidth, int screenHeight, int screenDensity) {
         MediaProjectionManager manager = (MediaProjectionManager) context.getSystemService(Context.MEDIA_PROJECTION_SERVICE);
         initVirtualDisplay(manager, data, screenWidth, screenHeight, screenDensity);
+        startAcquireImageLoop();
     }
 
     public ScreenCapturer(Context context, Intent data, int screenWidth, int screenHeight) {
@@ -41,32 +52,65 @@ public class ScreenCapturer {
     }
 
     private void initVirtualDisplay(MediaProjectionManager manager, Intent data, int screenWidth, int screenHeight, int screenDensity) {
-        mImageReader = ImageReader.newInstance(screenWidth, screenHeight, PixelFormat.RGBA_8888, 1);
+        mImageReader = ImageReader.newInstance(screenWidth, screenHeight, PixelFormat.RGBA_8888, 2);
         mMediaProjection = manager.getMediaProjection(Activity.RESULT_OK, data);
         mVirtualDisplay = mMediaProjection.createVirtualDisplay("screen-mirror",
                 screenWidth, screenHeight, screenDensity, DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR,
                 mImageReader.getSurface(), null, null);
+
+    }
+
+    private void startAcquireImageLoop() {
+        new Thread(new Runnable() {
+            @Override
+            public void run() {
+                Looper.prepare();
+                mImageAcquireLooper = Looper.myLooper();
+                mImageReader.setOnImageAvailableListener(new ImageReader.OnImageAvailableListener() {
+                    @Override
+                    public void onImageAvailable(ImageReader reader) {
+                        if (mLatestImage != null) {
+                            mLatestImage.close();
+                        }
+                        mLatestImage = reader.acquireNextImage();
+                        if (mLatestImage != null) {
+                            synchronized (mImageWaitingLock) {
+                                mImageWaitingLock.notify();
+                            }
+                        }
+                    }
+                }, null);
+                Looper.loop();
+            }
+        }).start();
     }
 
     public Image capture() {
+        if (mLatestImage == null) {
+            if (mImage != null) {
+                return mImage;
+            }
+            waitForImageAvailable();
+        }
         if (mImage != null) {
             mImage.close();
         }
-        mImage = mImageReader.acquireLatestImage();
-        if (mImage == null) {
-            Looper.prepare();
-            mImageReader.setOnImageAvailableListener(new ImageReader.OnImageAvailableListener() {
-                @Override
-                public void onImageAvailable(ImageReader reader) {
-                    Looper.myLooper().quit();
-                }
-            }, null);
-            Looper.loop();
-            mImage = mImageReader.acquireLatestImage();
-        }
+        mImage = mLatestImage;
+        mLatestImage = null;
         return mImage;
     }
 
+    private void waitForImageAvailable() {
+        Log.d(LOG_TAG, "waitForImageAvailable");
+        synchronized (mImageWaitingLock) {
+            try {
+                mImageWaitingLock.wait();
+            } catch (InterruptedException e) {
+                throw new ScriptInterruptedException();
+            }
+        }
+    }
+
 
     @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
     public void release() {
@@ -76,8 +120,17 @@ public class ScreenCapturer {
         if (mVirtualDisplay != null) {
             mVirtualDisplay.release();
         }
+        if (mImageReader != null) {
+            mImageReader.close();
+        }
+        if (mImageAcquireLooper != null) {
+            mImageAcquireLooper.quitSafely();
+        }
         if (mImage != null) {
             mImage.close();
         }
+        if (mLatestImage != null) {
+            mLatestImage.close();
+        }
     }
 }