diff --git a/README.md b/README.md
index a7c8718..05d07eb 100644
--- a/README.md
+++ b/README.md
@@ -21,7 +21,7 @@ Add the following dependency to your `pom.xml`.
   <dependency>
     <groupId>io.socket</groupId>
     <artifactId>socket.io-client</artifactId>
-    <version>0.8.3</version>
+    <version>0.9.0</version>
   </dependency>
 </dependencies>
 ```
@@ -30,7 +30,7 @@ Add the following dependency to your `pom.xml`.
 Add it as a gradle dependency for Android Studio, in `build.gradle`:
 
 ```groovy
-compile ('io.socket:socket.io-client:0.8.3') {
+compile ('io.socket:socket.io-client:0.9.0') {
   // excluding org.json which is provided by Android
   exclude group: 'org.json', module: 'json'
 }
@@ -131,8 +131,8 @@ OkHttpClient okHttpClient = new OkHttpClient.Builder()
   .build();
 
 // default settings for all sockets
-Socket.setDefaultOkHttpWebSocketFactory(okHttpClient);
-Socket.setDefaultOkHttpCallFactory(okHttpClient);
+IO.setDefaultOkHttpWebSocketFactory(okHttpClient);
+IO.setDefaultOkHttpCallFactory(okHttpClient);
 
 // set as an option
 opts = new IO.Options();
diff --git a/src/main/java/io/socket/client/IO.java b/src/main/java/io/socket/client/IO.java
index 07aa46c..6dd9758 100644
--- a/src/main/java/io/socket/client/IO.java
+++ b/src/main/java/io/socket/client/IO.java
@@ -6,6 +6,7 @@ import okhttp3.Call;
 import okhttp3.OkHttpClient;
 import okhttp3.WebSocket;
 
+import java.util.logging.Level;
 import javax.net.ssl.HostnameVerifier;
 import javax.net.ssl.SSLContext;
 import java.net.URI;
@@ -75,11 +76,15 @@ public class IO {
         Manager io;
 
         if (newConnection) {
-            logger.fine(String.format("ignoring socket cache for %s", source));
+            if (logger.isLoggable(Level.FINE)) {
+                logger.fine(String.format("ignoring socket cache for %s", source));
+            }
             io = new Manager(source, opts);
         } else {
             if (!managers.containsKey(id)) {
-                logger.fine(String.format("new io instance for %s", source));
+                if (logger.isLoggable(Level.FINE)) {
+                    logger.fine(String.format("new io instance for %s", source));
+                }
                 managers.putIfAbsent(id, new Manager(source, opts));
             }
             io = managers.get(id);
diff --git a/src/main/java/io/socket/client/Manager.java b/src/main/java/io/socket/client/Manager.java
index ba5e35a..026e0a0 100644
--- a/src/main/java/io/socket/client/Manager.java
+++ b/src/main/java/io/socket/client/Manager.java
@@ -259,10 +259,14 @@ public class Manager extends Emitter {
         EventThread.exec(new Runnable() {
             @Override
             public void run() {
-                logger.fine(String.format("readyState %s", Manager.this.readyState));
+                if (logger.isLoggable(Level.FINE)) {
+                    logger.fine(String.format("readyState %s", Manager.this.readyState));
+                }
                 if (Manager.this.readyState == ReadyState.OPEN || Manager.this.readyState == ReadyState.OPENING) return;
 
-                logger.fine(String.format("opening %s", Manager.this.uri));
+                if (logger.isLoggable(Level.FINE)) {
+                    logger.fine(String.format("opening %s", Manager.this.uri));
+                }
                 Manager.this.engine = new Engine(Manager.this.uri, Manager.this.opts);
                 final io.socket.engineio.client.Socket socket = Manager.this.engine;
                 final Manager self = Manager.this;
@@ -467,7 +471,9 @@ public class Manager extends Emitter {
     }
 
     /*package*/ void packet(Packet packet) {
-        logger.fine(String.format("writing packet %s", packet));
+        if (logger.isLoggable(Level.FINE)) {
+            logger.fine(String.format("writing packet %s", packet));
+        }
         final Manager self = this;
 
         if (packet.query != null && !packet.query.isEmpty() && packet.type == Parser.CONNECT) {
diff --git a/src/main/java/io/socket/client/Socket.java b/src/main/java/io/socket/client/Socket.java
index 5edfbfa..6aed091 100644
--- a/src/main/java/io/socket/client/Socket.java
+++ b/src/main/java/io/socket/client/Socket.java
@@ -262,7 +262,9 @@ public class Socket extends Emitter {
     }
 
     private void onclose(String reason) {
-        logger.fine(String.format("close (%s)", reason));
+        if (logger.isLoggable(Level.FINE)) {
+            logger.fine(String.format("close (%s)", reason));
+        }
         this.connected = false;
         this.id = null;
         this.emit(EVENT_DISCONNECT, reason);
@@ -316,7 +318,9 @@ public class Socket extends Emitter {
 
     private void onevent(Packet<JSONArray> packet) {
         List<Object> args = new ArrayList<Object>(Arrays.asList(toArray(packet.data)));
-        logger.fine(String.format("emitting event %s", args));
+        if (logger.isLoggable(Level.FINE)) {
+            logger.fine(String.format("emitting event %s", args));
+        }
 
         if (packet.id >= 0) {
             logger.fine("attaching ack callback to event");
@@ -343,7 +347,9 @@ public class Socket extends Emitter {
                     public void run() {
                         if (sent[0]) return;
                         sent[0] = true;
-                        logger.fine(String.format("sending ack %s", args.length != 0 ? args : null));
+                        if (logger.isLoggable(Level.FINE)) {
+                            logger.fine(String.format("sending ack %s", args.length != 0 ? args : null));
+                        }
 
                         JSONArray jsonArgs = new JSONArray();
                         for (Object arg : args) {
@@ -362,10 +368,14 @@ public class Socket extends Emitter {
     private void onack(Packet<JSONArray> packet) {
         Ack fn = this.acks.remove(packet.id);
         if (fn != null) {
-            logger.fine(String.format("calling ack %s with %s", packet.id, packet.data));
+            if (logger.isLoggable(Level.FINE)) {
+                logger.fine(String.format("calling ack %s with %s", packet.id, packet.data));
+            }
             fn.call(toArray(packet.data));
         } else {
-            logger.fine(String.format("bad ack %s", packet.id));
+            if (logger.isLoggable(Level.FINE)) {
+                logger.fine(String.format("bad ack %s", packet.id));
+            }
         }
     }
 
@@ -391,7 +401,9 @@ public class Socket extends Emitter {
     }
 
     private void ondisconnect() {
-        logger.fine(String.format("server disconnect (%s)", this.nsp));
+        if (logger.isLoggable(Level.FINE)) {
+            logger.fine(String.format("server disconnect (%s)", this.nsp));
+        }
         this.destroy();
         this.onclose("io server disconnect");
     }
@@ -418,7 +430,9 @@ public class Socket extends Emitter {
             @Override
             public void run() {
                 if (Socket.this.connected) {
-                    logger.fine(String.format("performing disconnect (%s)", Socket.this.nsp));
+                    if (logger.isLoggable(Level.FINE)) {
+                        logger.fine(String.format("performing disconnect (%s)", Socket.this.nsp));
+                    }
                     Socket.this.packet(new Packet(Parser.DISCONNECT));
                 }
 
diff --git a/src/main/java/io/socket/parser/IOParser.java b/src/main/java/io/socket/parser/IOParser.java
index 787d35a..813c16c 100644
--- a/src/main/java/io/socket/parser/IOParser.java
+++ b/src/main/java/io/socket/parser/IOParser.java
@@ -1,6 +1,5 @@
 package io.socket.parser;
 
-import io.socket.client.IO;
 import io.socket.hasbinary.HasBinary;
 import org.json.JSONException;
 import org.json.JSONTokener;
@@ -31,7 +30,9 @@ final public class IOParser implements Parser {
                 obj.type = obj.type == EVENT ? BINARY_EVENT : BINARY_ACK;
             }
 
-            logger.fine(String.format("encoding packet %s", obj));
+            if (logger.isLoggable(Level.FINE)) {
+                logger.fine(String.format("encoding packet %s", obj));
+            }
 
             if (BINARY_EVENT == obj.type || BINARY_ACK == obj.type) {
                 encodeAsBinary(obj, callback);
@@ -62,7 +63,9 @@ final public class IOParser implements Parser {
                 str.append(obj.data);
             }
 
-            logger.fine(String.format("encoded %s as %s", obj, str));
+            if (logger.isLoggable(Level.FINE)) {
+                logger.fine(String.format("encoded %s as %s", obj, str));
+            }
             return str.toString();
         }
 
@@ -182,7 +185,9 @@ final public class IOParser implements Parser {
                 }
             }
 
-            logger.fine(String.format("decoded %s as %s", str, p));
+            if (logger.isLoggable(Level.FINE)) {
+                logger.fine(String.format("decoded %s as %s", str, p));
+            }
             return p;
         }
 
diff --git a/src/main/java/io/socket/parser/Parser.java b/src/main/java/io/socket/parser/Parser.java
index b4808b0..66367d5 100644
--- a/src/main/java/io/socket/parser/Parser.java
+++ b/src/main/java/io/socket/parser/Parser.java
@@ -1,16 +1,5 @@
 package io.socket.parser;
 
-import io.socket.emitter.Emitter;
-import io.socket.hasbinary.HasBinary;
-import org.json.JSONException;
-import org.json.JSONTokener;
-
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.List;
-import java.util.logging.Level;
-import java.util.logging.Logger;
-
 public interface Parser {
 
     /**