diff --git a/lib/processor.js b/lib/processor.js
index 846fe72..4129b39 100644
--- a/lib/processor.js
+++ b/lib/processor.js
@@ -36,48 +36,41 @@ Processor.prototype.cast = function(table, values) {
 /**
  * Cast a value
  *
+ * @param {String} table
  * @param {String} key
- * @param {Object|String|Integer|Array} value
- * @param {Object} schema
+ * @param {Object|String|Number|Array} value
+ * @param {Object} attributes
  * @api private
  */
 
  Processor.prototype.castValue = function(table, key, value, attributes) {
-
-  var self = this;
-  var identity = table;
-  var attr;
-
-  // Check for a columnName, serialize so we can do any casting
-  Object.keys(this.schema[identity].attributes).forEach(function(attribute) {
-    if(self.schema[identity].attributes[attribute].columnName === key) {
-      attr = attribute;
-      return;
-    }
-  });
-
-  if(!attr) attr = key;
-
-  // Lookup Schema "Type"
-  if(!this.schema[identity] || !this.schema[identity].attributes[attr]) return;
-  var type;
-
-  if(!_.isPlainObject(this.schema[identity].attributes[attr])) {
-    type = this.schema[identity].attributes[attr];
-  } else {
-    type = this.schema[identity].attributes[attr].type;
+  var _schema = this.schema[table];
+  if (!_schema) return;
+
+  // Cache mappings of column names to attribute names to boost further castings
+  if (!_schema._columns) {
+    _schema._columns = {};
+    _.each(_schema.attributes, function(attr, attrName) {
+      _schema._columns[attr.columnName || attrName] = attrName;
+    });
   }
 
+  var attr = _schema._columns[key];
+  if (!_schema.attributes[attr]) return;
 
+  var type = _.isPlainObject(_schema.attributes[attr])
+    ? _schema.attributes[attr].type
+    : _schema.attributes[attr];
   if(!type) return;
 
   // Attempt to parse Array
-  if(type === 'array') {
-    try {
-      attributes[key] = JSON.parse(value);
-    } catch(e) {
-      return;
-    }
+  switch(type) {
+    case 'array':
+      try {
+        attributes[key] = JSON.parse(value);
+      } catch(e) {
+        return;
+      }
+      break;
   }
-
 };