Edit orders extremely slow

He guys, i did many searches but couldnt find a solution for my problem. this is why i registered over here. im using the newest version of opencart 2.0.1.1 and im using it for more webshops but somehow this one webshop has a problem.

When i try to edit the order it goes extremely show when i go to payment details, no errors in console only regarding:

ynchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user's experience. For more help, check http://xhr.spec.whatwg.org/.

Someone any idea how i can tackle this problem, the shop is going well at the moment but it is a nightmare to change the status of products..

thanks in advance!

i got the same problem on 2.0.1.1. It is both - on order view and order edit.

@hat opencart version do you have? Have you solved this problem by any chance?