PDFBOX-5660: optimize, as suggested by Valery Bokov; closes #234

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1928157 13f79535-47bb-0310-9956-ffa450edef68

Author: THausherr

pdfbox/src/main/java/org/apache/pdfbox/pdmodel/common/function/type4/Operators.java

@@ -74,7 +74,7 @@ public class Operators
     private static final Operator POP = new StackOperators.Pop();
     private static final Operator ROLL = new StackOperators.Roll();
 
-    private final Map<String, Operator> operators = new java.util.HashMap<>();
+    private final Map<String, Operator> operators = new java.util.HashMap<>(42);
 
     /**
      * Creates a new Operators object with the default set of operators.