diff --git a/src/main/java/de/bixilon/minosoft/data/assets/AssetsManager.java b/src/main/java/de/bixilon/minosoft/data/assets/AssetsManager.java
index 7d178ff98..0bd9b1fde 100644
--- a/src/main/java/de/bixilon/minosoft/data/assets/AssetsManager.java
+++ b/src/main/java/de/bixilon/minosoft/data/assets/AssetsManager.java
@@ -196,7 +196,7 @@ public class AssetsManager {
             // ToDo: use input steam twice ?
             ByteArrayOutputStream outputBuffer = new ByteArrayOutputStream();
             int len;
-            byte[] buffer = new byte[2048];
+            byte[] buffer = new byte[4096];
             while ((len = versionJar.read(buffer)) > 0) {
                 outputBuffer.write(buffer, 0, len);
             }
diff --git a/src/main/java/de/bixilon/minosoft/gui/main/StartProgressWindow.java b/src/main/java/de/bixilon/minosoft/gui/main/StartProgressWindow.java
index f1df07f84..ea2a8797e 100644
--- a/src/main/java/de/bixilon/minosoft/gui/main/StartProgressWindow.java
+++ b/src/main/java/de/bixilon/minosoft/gui/main/StartProgressWindow.java
@@ -78,7 +78,7 @@ public class StartProgressWindow extends Application {
     }
 
     @Override
-    public void start(Stage stage) throws Exception {
+    public void start(Stage stage) {
         toolkitLatch.countDown();
     }
 }
diff --git a/src/main/java/de/bixilon/minosoft/util/Util.java b/src/main/java/de/bixilon/minosoft/util/Util.java
index 32b63f21a..27ac9f876 100644
--- a/src/main/java/de/bixilon/minosoft/util/Util.java
+++ b/src/main/java/de/bixilon/minosoft/util/Util.java
@@ -88,7 +88,7 @@ public final class Util {
         ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
 
         int res = 0;
-        byte[] buf = new byte[1024];
+        byte[] buf = new byte[4096];
         while (res >= 0) {
             res = gzipInputStream.read(buf, 0, buf.length);
             if (res > 0) {
@@ -209,11 +209,10 @@ public final class Util {
         copyFile(getInputStreamByURL(url), new GZIPOutputStream(new FileOutputStream(destination)));
     }
 
-
     public static void copyFile(InputStream inputStream, OutputStream output) throws IOException {
-        byte[] buffer = new byte[1024];
+        byte[] buffer = new byte[4096];
         int length;
-        while ((length = inputStream.read(buffer, 0, 1024)) != -1) {
+        while ((length = inputStream.read(buffer, 0, 4096)) != -1) {
             output.write(buffer, 0, length);
         }
         inputStream.close();