maybe its not the website but your computer.
I don't have any issues. I allow all Cookies, and I don't get the Cookie pop up, I dont have to log in every time. I use Chrome, Windows 10 and everything runs smooth for me. I have now tested on 2 different laptops.
The issue may be because people are not allowing all Cookies. The Cookies allow the website to function properly , so if you are not allowing all Cookies, then you are not letting the software remember such things as your log in details.