Evernote CEO Phil Libin:

Synchronization is now about 4X faster than ever before. This applies to any version of Evernote that you use. Sync now often takes a couple of seconds to complete, and when you get a new phone or computer, downloading your notes will take much less time. If you have a small account, you might not notice that much of a difference. On the other hand, if your account is large, or you’ve been using Evernote for many years, or you share notebooks with other users, or your entire company uses Evernote Business, you’ll see massive improvements. All four of these things happen to be true for many early Evernote employees, so the performance gains we’re seeing at the office are amazing. That explains the rejoicing.

The performance gains are noticeable for my account, which has over 2200 notes. This is especially good news for me as I use the Evernote apps a lot when I’m on 3G, and hopefully it’ll result in better handling of large attachments as well.

See also: the technical explanation of what the Evernote engineers did.