So many people have so much invested in Evernote. I've been a paid subscriber for many years. Perhaps that is why Evernote management feels that they can afford to simply ignore everyone's concerns over the snail-like speed of version 10.
My most frequent use is to grab-and-go with some information to archive or organize later. Evernote used to simply Do It, and I could get on with my work. Now Evernote calls attention to itself while I wonder what has gone wrong and when or if it will respond.
Someone bet the farm on the Javascript-based technology. So now they just hunker down, trying to ignore the withering criticism, hoping that they can introduce new features (restore old features!) and improve the speed fast enough, before users abandon ship and find a suitable replacement.
We users would be much more patient and understanding, I feel, if management directly, forthrightly addressed the speed issue. Then keep addressing it until it becomes a non-issue. As things stand now, I've no idea whether management cares, how much they care, what priority they are putting on fixing it, whether it will ever be fixed to any significant degree.