[IMP] fields: speedup `Float.convert_to_cache` by not rounding the value

openerp/fields.py

@@ -1096,6 +1096,8 @@ class Float(Field):
     def convert_to_cache(self, value, record, validate=True):
         # apply rounding here, otherwise value in cache may be wrong!
         value = float(value or 0.0)
+        if not validate:
+            return value
         digits = self.digits
         return float_round(value, precision_digits=digits[1]) if digits else value