I suspect the answer is that they are not switched on for a reason, however probably the best approach would be to raise a support request.
02-04-2016 01:15 AM - last edited on 02-08-2016 11:51 AM by kathleen_jo
thanks for your suggestion. I will raise a support request. Adding access control allow origin headers has no impact on performance nor security as they soley allow browsers to pass information realted to loaded resources.