From France i got thoses super slow loading times too. And by loading times i mean slow OV refreshing, super slow 2d pictures loading, very extra slow toolbox refreshing. I got those 403/404 errors since february, as i already expleined it in my mail to Celia/Chris.
Like @susi, my history is really slow too, i sometimes need to close it and repoen hoping it work.
As @Nseraf said, i do not play that much now since few month because of this. I really like this science researching platform, and it's only because it's about science i still reap/complete, but i stoped playing since a while.
Like this picture, it's all the time like this, with more red error than good loadings :
I tried all possibilities, from extensions removing, USA VPN, different browsers, another computer with default network settings....
And as @Nseraf said, i really would prefer the old good fast loading EW without any super new tools. Like Magic hand that i think noone use, or Z plane that could be load option.