Since the most recent update all maps i have opened in the editor that have multiple layers take an extremely long tome to load (up to 10 minutes). Once loaded the maps are very laggy when you move around them causing the off screen textures, once revealed, to slow down the browser again often causing a time out.
I have tried multiple maps of my own as well as freshley cloned maps from the public library and all are acting similarly.
I have also created a new map from scratch thinking that the problem might be the new textures library setup not being 'cooperative' with the old maps. Things were going perfectly untill i tried to add an aditional layer and then i got a timeout on my browser. Up until that moment everything behaved normaly with both the editing and loading of the map.
Just in case, I tried multiple browsers across various maps and all behave the same way.
I'm confident you will be able to correct this problem and resume an otherwise excellent tool of map making excellence.