If you haven't done so already, be sure to upgrade your Evernote client to the latest version. Evernote 4 is a much much better version of Evernote than any of the Evernote 3.x clients that were previously available. I've been using it for a couple weeks now and it is a lot faster and smoother than what I was using before. From the Evernote blog:
The new Evernote is completely written from scratch and it acts just like it. After a somewhat lengthy install process (it has to un-install the old Evernote and replace it entirely, don't worry, you won't lose your old notes), I fired up the new Evernote and was shocked by how fast it loaded. Normally I would fire up the app and have to wait ~1-2 minutes for the clunky Java loader to bring the screen up, but now the Evernote client comes up almost instantaneously! That alone would make this new version a huge improvement in my book, but they've also gone ahead and upgraded the client design with a more streamlined user interface that makes it easier to navigate your notes.Starting from scratch
Evernote 4 is a major departure from Evernote 3.5 in every way. While 3.5 added tons of great new features, there were some problems we simply couldn’t fix: the blurry fonts, slow startup times, large memory footprint, and poor support for certain graphics cards were all issues that the technology behind 3.5 (Windows .net and WPF) was incapable of resolving. As a result, we ended up chasing down platform bugs rather than adding the great features our users wanted.
So we decided to start over from scratch, with fast, native C++ that we knew we could rely on. As you’ll see, the results are amazing. This new version will set a foundation for rapid improvement.
On our test hardware, Evernote 4 starts five times faster, and uses half the memory of Evernote 3.5.
The icing on the cake is an improved web clipper (especially for Internet Explorer) that makes it easier to save and organize notes on the fly. All in all this is a huge improvement for Evernote and I think this release will go a long way to appeasing disgruntled Evernote users who felt that the software was slow and clunky.