I am in SW architecture. I can understand what happened. The Evernote Team wanted to line everything up from a clean and uniform new base, same for all platform etc... But no one considered the performance aspect, for legacy users being with more than 1,000 notes (not mentionning those > 10,000...). No one at Evernote considered that acceptable latency thresholds would be 2x or 3x crossed. No one at Evernote considered that the SW would become ultimately unusable. The issue is that there is generally no way back beyond this point, since the performance issue is intimately tight to architecture choices that were made. Unfortunately I don't expect miracles here.