diff --git a/src/main/java/info/istlab/ServerTester/JTAConsole.java b/src/main/java/info/istlab/ServerTester/JTAConsole.java
index 1bf1fc8..ad6ce06 100644
--- a/src/main/java/info/istlab/ServerTester/JTAConsole.java
+++ b/src/main/java/info/istlab/ServerTester/JTAConsole.java
@@ -20,6 +20,7 @@
 
 import javax.swing.JFrame;
 import javax.swing.JScrollPane;
+import javax.swing.SwingUtilities;
 import javax.swing.text.BadLocationException;
 
 public class JTAConsole extends MyRSJTextArea
@@ -28,6 +29,7 @@
     // static Point lastActivePoint;
     static Stack<JTAConsole> winStack = new Stack<JTAConsole>();
     JFrame frame;
+    JScrollPane scrollpane;
     Process process;
     Thread thread;
     InputStream instream;
@@ -44,9 +46,9 @@
 
     public JTAConsole(String title, int win_height) {
         frame = new JFrame(title);
-        frame.getContentPane().add(new JScrollPane(this));
+        frame.getContentPane().add(scrollpane = new JScrollPane(this));
         frame.setSize(500, win_height);
-        frame.setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE);
+        frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
         frame.addWindowListener(this);
         if (winStack.size() > 0) {
             JTAConsole last = winStack.peek();
@@ -55,7 +57,7 @@
                 frame.setLocation(lastFrameP.x + 470, lastFrameP.y);
             }
         } else {
-            frame.setLocation(Host.mainhost.underneath(5,10));
+            frame.setLocation(Host.mainhost.underneath(5, 10));
         }
         addKeyListener(this);
         addMouseListener(this);
@@ -63,10 +65,12 @@
         winStack.push(this);
         originalContent = new StringBuilder();
 
-        frame.setVisible(true); // 表示を遅らせないと、RSJTextAreaでエラーが出る
+        SwingUtilities.invokeLater(() -> {
+            frame.setVisible(true); // 表示を遅らせないと、RSJTextAreaでエラーが出る
+        });
     }
 
-    public void Systemoutprintln(String s) {
+    public synchronized void Systemoutprintln(String s) {
         append(s + "\n");
         originalContent.append(s + "\n");
         int len = getDocument().getLength();
@@ -74,6 +78,10 @@
             setCaretPosition(len);
     }
 
+    public synchronized void setText(String s) {
+        super.setText(s);
+    }
+
     public void startBR(Process proc) {
         process = proc;
         try {
@@ -147,18 +155,23 @@
 
     @Override
     public void windowClosing(WindowEvent e) {
+        setText("");
         destroyProcess();
+        scrollpane.removeAll();
+        frame.getContentPane().removeAll();
 
         winStack.remove(this);
-        setVisible(false);
         if (!process.isAlive()) {
             // Launcher.allProcs.remove(process);
         }
+        SwingUtilities.invokeLater(() -> {
+            // frame.setVisible(false); // 表示を遅らせないと、RSJTextAreaでエラーが出る
+            frame.dispose();
+        });
     }
 
     @Override
     public void windowClosed(WindowEvent e) {
-
     }
 
     @Override
@@ -286,5 +299,4 @@
 
     }
 
-
 }
\ No newline at end of file
diff --git a/src/main/java/info/istlab/ServerTester/MyRSJTextArea.java b/src/main/java/info/istlab/ServerTester/MyRSJTextArea.java
index d3fda0c..382e5b1 100644
--- a/src/main/java/info/istlab/ServerTester/MyRSJTextArea.java
+++ b/src/main/java/info/istlab/ServerTester/MyRSJTextArea.java
@@ -57,6 +57,7 @@
         }
         setSyntaxScheme(scheme);
 
+
         // scheme.getStyle(Token.COMMENT_EOL).background = Color.cyan;
         // scheme.getStyle(Token.COMMENT_DOCUMENTATION).background =
         // Color.cyan.brighter();
@@ -77,7 +78,7 @@
         // scheme.getStyle(Token.LITERAL_CHAR).foreground = Color.black;
 
         setHighlightCurrentLine(false); // カーソル行のハイライトを消す
-        setCodeFoldingEnabled(true);
+        // setCodeFoldingEnabled(true);
 
     }
 
diff --git a/src/main/java/info/istlab/ServerTester/RemoteHostsWindow.java b/src/main/java/info/istlab/ServerTester/RemoteHostsWindow.java
index 21de6e7..ee36785 100644
--- a/src/main/java/info/istlab/ServerTester/RemoteHostsWindow.java
+++ b/src/main/java/info/istlab/ServerTester/RemoteHostsWindow.java
@@ -79,7 +79,7 @@
     @Override
     public void run() {
         try {
-            Thread.sleep(1000);
+            Thread.sleep(300);
         } catch (InterruptedException e) {
             e.printStackTrace();
         }