diff --git a/CHANGES b/CHANGES
index 24e2fe4..0648e5f 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,7 +1,10 @@
 0.30.3 2014-02-20
         - Return json request in response if given (diewald)
-	- [bugfix] ClassSpans and WithinSpans check skipTo in advance now (diewald)
-	- Performance improvements (diewald)
+	- [bugfix] ClassSpans and WithinSpans check skipTo
+	  in advance now (diewald)
+	- Compilerfriendly logging rules, resulting
+	  in significant performance improvements (diewald)
+	- Small refactorings (diewald)
 
 0.30.2 2014-02-14
         - [bugfix] wrapper uses correct distance constraint
diff --git a/src/main/java/de/ids_mannheim/korap/index/FieldDocument.java b/src/main/java/de/ids_mannheim/korap/index/FieldDocument.java
index 292592c..8363bf2 100644
--- a/src/main/java/de/ids_mannheim/korap/index/FieldDocument.java
+++ b/src/main/java/de/ids_mannheim/korap/index/FieldDocument.java
@@ -19,9 +19,6 @@
 
 import java.util.*;
 
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
 /*
 Todo: Store primary data at base/cons field.
 All other Termvectors should have no stored field!
@@ -36,8 +33,6 @@
 public class FieldDocument extends KorapDocument {
     ObjectMapper mapper = new ObjectMapper();
 
-    private final static Logger log = LoggerFactory.getLogger(FieldDocument.class);
-
     public Document doc = new Document();
 
     private FieldType tvField   = new FieldType(TextField.TYPE_STORED);
diff --git a/src/main/java/de/ids_mannheim/korap/query/SpanNextQuery.java b/src/main/java/de/ids_mannheim/korap/query/SpanNextQuery.java
index 22c55e7..6a51062 100644
--- a/src/main/java/de/ids_mannheim/korap/query/SpanNextQuery.java
+++ b/src/main/java/de/ids_mannheim/korap/query/SpanNextQuery.java
@@ -20,7 +20,7 @@
 import de.ids_mannheim.korap.query.spans.NextSpans;
 
 /** Matches spans which are directly next to each other. 
- * 	This is identical to a phrase query with exactly two clauses. 
+ *  this is identical to a phrase query with exactly two clauses. 
  */
 public class SpanNextQuery extends SimpleSpanQuery implements Cloneable {
 
diff --git a/src/test/resources/queries/cosmas20.json b/src/test/resources/queries/cosmas20.json
index 3a4e040..86a7df6 100644
--- a/src/test/resources/queries/cosmas20.json
+++ b/src/test/resources/queries/cosmas20.json
@@ -4,7 +4,7 @@
     "@type" : "korap:group",
     "operation" : "operation:submatch",
     "classRef" : [ 1 ],
-    "operands" : [ {
+      "operands" : [ {
       "@type" : "korap:group",
       "operation" : "operation:position",
       "frame" : "frame:endswith",