diff --git a/htroot/WatchCrawler_p.java b/htroot/WatchCrawler_p.java
index f09020a5d..597d91b2c 100644
--- a/htroot/WatchCrawler_p.java
+++ b/htroot/WatchCrawler_p.java
@@ -262,7 +262,7 @@ public class WatchCrawler_p {
                                 htmlFilterContentScraper scraper = new htmlFilterContentScraper(new yacyURL(file));
                                 //OutputStream os = new htmlFilterOutputStream(null, scraper, null, false);
                                 Writer writer = new htmlFilterWriter(null,null,scraper,null,false);
-                                serverFileUtils.write(fileString,writer);
+                                serverFileUtils.copy(fileString, writer);
                                 writer.close();
                                 
                                 //String headline = scraper.getHeadline();
diff --git a/htroot/xml/util/getpageinfo_p.java b/htroot/xml/util/getpageinfo_p.java
index 7da620b0e..4e13a42aa 100644
--- a/htroot/xml/util/getpageinfo_p.java
+++ b/htroot/xml/util/getpageinfo_p.java
@@ -88,7 +88,7 @@ public class getpageinfo_p {
                     htmlFilterContentScraper scraper = new htmlFilterContentScraper(u);
                     //OutputStream os = new htmlFilterOutputStream(null, scraper, null, false);
                     Writer writer = new htmlFilterWriter(null,null,scraper,null,false);
-                    serverFileUtils.write(contentString,writer);
+                    serverFileUtils.copy(contentString,writer);
                     writer.close();
                     
                     // put the document title 
diff --git a/htroot/yacy/transfer.java b/htroot/yacy/transfer.java
index e7346fa22..c66b249c9 100644
--- a/htroot/yacy/transfer.java
+++ b/htroot/yacy/transfer.java
@@ -137,7 +137,7 @@ public final class transfer {
                     File file = new File(path, filename);
                     try {
                         if (file.getCanonicalPath().toString().startsWith(path.getCanonicalPath().toString())){
-                            serverFileUtils.write(fileString.getBytes(), file);
+                            serverFileUtils.copy(fileString.getBytes(), file);
                             String md5t = serverCodings.encodeMD5Hex(file);
                             if (md5t.equals(md5)) {
                                 prop.put("response", "ok");
diff --git a/source/de/anomic/http/httpTemplate.java b/source/de/anomic/http/httpTemplate.java
index be22d5c89..393c5f465 100644
--- a/source/de/anomic/http/httpTemplate.java
+++ b/source/de/anomic/http/httpTemplate.java
@@ -435,7 +435,7 @@ public final class httpTemplate {
 			}
                      */
 
-                    serverFileUtils.write(replacement, out);
+                    serverFileUtils.copy(replacement, out);
                 } else {
                     // inconsistency, simply finalize this
                     serverFileUtils.copy(pis, out);
@@ -479,7 +479,7 @@ public final class httpTemplate {
                 byte[] tmp=new byte[2];
                 tmp[0]=hash;
                 tmp[1]=(byte)bb;
-                serverFileUtils.write(tmp, out);
+                serverFileUtils.copy(tmp, out);
             }
         }
         //System.out.println(structure.toString()); //DEBUG
diff --git a/source/de/anomic/http/httpd.java b/source/de/anomic/http/httpd.java
index 81674ee58..ce8581838 100644
--- a/source/de/anomic/http/httpd.java
+++ b/source/de/anomic/http/httpd.java
@@ -1236,7 +1236,7 @@ public final class httpd implements serverHandler {
 
             if (! method.equals(httpHeader.METHOD_HEAD)) {
                 // write the array to the client
-                serverFileUtils.write(result, respond);
+                serverFileUtils.copy(result, respond);
             }
             respond.flush();
         } catch (Exception e) { 
diff --git a/source/de/anomic/http/httpdFileHandler.java b/source/de/anomic/http/httpdFileHandler.java
index 5c0e82346..f73cca74f 100644
--- a/source/de/anomic/http/httpdFileHandler.java
+++ b/source/de/anomic/http/httpdFileHandler.java
@@ -768,7 +768,7 @@ public final class httpdFileHandler {
                                     httpVersion, 200, null, mimeType, result.length,
                                     targetDate, null, tp.getOutgoingHeader(),
                                     contentEncoding, null, nocache);
-                            serverFileUtils.write(result, out);
+                            serverFileUtils.copy(result, out);
                         }  
                     }
                 } else { // no html
diff --git a/source/de/anomic/index/indexRAMRI.java b/source/de/anomic/index/indexRAMRI.java
index bf1b5dae5..8acd830fc 100644
--- a/source/de/anomic/index/indexRAMRI.java
+++ b/source/de/anomic/index/indexRAMRI.java
@@ -178,7 +178,7 @@ public final class indexRAMRI implements indexRI {
         if (writeBuffer != null) {
             serverByteBuffer bb = writeBuffer.getBuffer();
             //System.out.println("*** byteBuffer size = " + bb.length());
-            serverFileUtils.write(bb.getBytes(), indexDumpFile);
+            serverFileUtils.copy(bb.getBytes(), indexDumpFile);
             writeBuffer.close();
         }
         dumpArray.close();
diff --git a/source/de/anomic/kelondro/kelondroAttrSeq.java b/source/de/anomic/kelondro/kelondroAttrSeq.java
index 5129aeb79..ef09089a8 100644
--- a/source/de/anomic/kelondro/kelondroAttrSeq.java
+++ b/source/de/anomic/kelondro/kelondroAttrSeq.java
@@ -204,7 +204,7 @@ public class kelondroAttrSeq {
         if (out.toString().endsWith(".gz")) {
             serverFileUtils.writeAndGZip((new String(sb)).getBytes(), out);
         } else {
-            serverFileUtils.write((new String(sb)).getBytes(), out);
+            serverFileUtils.copy((new String(sb)).getBytes(), out);
         }
     }
     
diff --git a/source/de/anomic/kelondro/kelondroRowCollection.java b/source/de/anomic/kelondro/kelondroRowCollection.java
index 5433cb9af..dad9ae1b8 100644
--- a/source/de/anomic/kelondro/kelondroRowCollection.java
+++ b/source/de/anomic/kelondro/kelondroRowCollection.java
@@ -183,7 +183,7 @@ public class kelondroRowCollection {
     }
     
     public void saveCollection(File file) throws IOException {
-        serverFileUtils.write(exportCollection(), file);
+        serverFileUtils.copy(exportCollection(), file);
     }
 
     public kelondroRow row() {
diff --git a/source/de/anomic/plasma/parser/mimeType/odtDetector.java b/source/de/anomic/plasma/parser/mimeType/odtDetector.java
index fecc9239d..2e9df61f2 100644
--- a/source/de/anomic/plasma/parser/mimeType/odtDetector.java
+++ b/source/de/anomic/plasma/parser/mimeType/odtDetector.java
@@ -81,7 +81,7 @@ public class odtDetector implements MagicDetector {
         File dstFile = null;
         try {
             dstFile = File.createTempFile("mimeTypeParser",".tmp");
-            serverFileUtils.write(data,dstFile);
+            serverFileUtils.copy(data,dstFile);
             return process(dstFile, offset, length, bitmask, comparator, mimeType, params);
         } catch (IOException e) {
             return null;
diff --git a/source/de/anomic/plasma/plasmaHTCache.java b/source/de/anomic/plasma/plasmaHTCache.java
index f940bed6f..2e40c0891 100644
--- a/source/de/anomic/plasma/plasmaHTCache.java
+++ b/source/de/anomic/plasma/plasmaHTCache.java
@@ -373,7 +373,7 @@ public final class plasmaHTCache {
         try {
             deleteFile(file);
             file.getParentFile().mkdirs();
-            serverFileUtils.write(array, file);
+            serverFileUtils.copy(array, file);
         } catch (FileNotFoundException e) {
             // this is the case of a "(Not a directory)" error, which should be prohibited
             // by the shallStoreCache() property. However, sometimes the error still occurs
diff --git a/source/de/anomic/server/serverCore.java b/source/de/anomic/server/serverCore.java
index bfdefa1aa..5027f2181 100644
--- a/source/de/anomic/server/serverCore.java
+++ b/source/de/anomic/server/serverCore.java
@@ -422,6 +422,9 @@ public final class serverCore extends serverAbstractThread implements serverThre
                 // set a non-zero linger, that means that a socket.close() blocks until all data is written
                 controlSocket.setSoLinger(true, this.timeout);
                 
+                // ensure that MTU-48 is not exceeded to prevent that routers cannot handle large data packets
+                controlSocket.setSendBufferSize(1440);
+                
                 // create session
                 Session connection = new Session(sessionThreadGroup, controlSocket, this.timeout);
                 this.busySessions.add(connection);
diff --git a/source/de/anomic/server/serverFileUtils.java b/source/de/anomic/server/serverFileUtils.java
index 4ca643b42..7ee498bfa 100644
--- a/source/de/anomic/server/serverFileUtils.java
+++ b/source/de/anomic/server/serverFileUtils.java
@@ -72,10 +72,10 @@ import de.anomic.tools.nxTools;
 
 public final class serverFileUtils {
 
-    private static final int DEFAULT_BUFFER_SIZE = 512;
+    private static final int DEFAULT_BUFFER_SIZE = 1024; // this is also the maximum chunk size
     
     public static long copy(InputStream source, OutputStream dest) throws IOException {
-        return copy(source,dest, -1);
+        return copy(source, dest, -1);
     }
     
     /**
@@ -133,7 +133,7 @@ public final class serverFileUtils {
     }
     
     public static int copy(Reader source, Writer dest) throws IOException {        
-        char[] buffer = new char[4096];
+        char[] buffer = new char[DEFAULT_BUFFER_SIZE];
         int count = 0;
         int n = 0;
         try {
@@ -151,7 +151,7 @@ public final class serverFileUtils {
     public static void copy(InputStream source, File dest) throws IOException {
         copy(source,dest,-1);
     }
-
+    
     /**
     * Copies an InputStream to a File.
     * @param source    InputStream
@@ -213,10 +213,6 @@ public final class serverFileUtils {
         }
     }
 
-    public static void copy(File source, File dest) throws IOException {
-        copy(source,dest,-1);
-    }
-    
     /**
     * Copies a File to a File.
     * @param source    File
@@ -227,19 +223,28 @@ public final class serverFileUtils {
     * @see #copyRange(File source, OutputStream dest, int start)
     * @see #copy(File source, OutputStream dest)
     */
-    public static void copy(File source, File dest, long count) throws IOException {
+    public static void copy(File source, File dest) throws IOException {
         FileInputStream fis = null;
         FileOutputStream fos = null;
         try {
             fis = new FileInputStream(source);
             fos = new FileOutputStream(dest);
-            copy(fis, fos, count);
+            copy(fis, fos, -1);
         } finally {
             if (fis != null) try {fis.close();} catch (Exception e) {}
             if (fos != null) try {fos.close();} catch (Exception e) {}
         }
     }
 
+    public static void copy(byte[] source, OutputStream dest) throws IOException {
+        dest.write(source, 0, source.length);
+        dest.flush();
+    }
+    
+    public static void copy(byte[] source, File dest) throws IOException {
+        copy(new ByteArrayInputStream(source), dest);
+    }
+
     public static byte[] read(InputStream source) throws IOException {
         return read(source,-1);
     }
@@ -297,27 +302,13 @@ public final class serverFileUtils {
         GZIPOutputStream zipOut = null;
         try {
             zipOut = new GZIPOutputStream(dest);
-            write(source, zipOut);
+            copy(source, zipOut);
             zipOut.close();
         } finally {
             if (zipOut != null) try { zipOut.close(); } catch (Exception e) {}
         }
     }
     
-    public static void write(String source, Writer dest) throws IOException {
-        dest.write(source);
-        dest.flush();
-    }
-
-    public static void write(byte[] source, OutputStream dest) throws IOException {
-        dest.write(source, 0, source.length);
-        dest.flush();
-    }
-
-    public static void write(byte[] source, File dest) throws IOException {
-        copy(new ByteArrayInputStream(source), dest);
-    }
-    
     /**
      * This function determines if a byte array is gzip compressed and uncompress it
      * @param source properly gzip compressed byte array
diff --git a/source/de/anomic/server/serverSystem.java b/source/de/anomic/server/serverSystem.java
index f9d4529f1..1edac6106 100644
--- a/source/de/anomic/server/serverSystem.java
+++ b/source/de/anomic/server/serverSystem.java
@@ -328,7 +328,7 @@ public final class serverSystem {
     }
 
     public static void deployScript(File scriptFile, String theScript) throws IOException {
-        serverFileUtils.write(theScript.getBytes(), scriptFile);
+        serverFileUtils.copy(theScript.getBytes(), scriptFile);
         try {
             Runtime.getRuntime().exec("chmod 755 " + scriptFile.getAbsolutePath().replaceAll(" ", "\\ ")).waitFor();
         } catch (InterruptedException e) {
diff --git a/source/yacy.java b/source/yacy.java
index ab04a916e..6534bbb67 100644
--- a/source/yacy.java
+++ b/source/yacy.java
@@ -286,7 +286,7 @@ public final class yacy {
             } catch (IOException e) {}
 
             final File htdocsReadme = new File(htDocsPath, "readme.txt");
-            if (!(htdocsReadme.exists())) try {serverFileUtils.write((
+            if (!(htdocsReadme.exists())) try {serverFileUtils.copy((
                     "This is your root directory for individual Web Content\r\n" +
                     "\r\n" +
                     "Please place your html files into the www subdirectory.\r\n" +