Importantly, the game engine has an FPS cap regardless of whether VSync is disabled or not - by default, the game is capped to a maximum of 62 FPS.
However if you find the image 'tearing' annoying, you can enable VSync and counter the subsequent performance drop by also enabling Triple Buffering - see this page for details of how to enable it properly. Thus enabling VSync can have a major negative performance impact, and the easiest solution is to leave it disabled. When VSync is enabled (set to Yes), your maximum FPS will be capped at your monitor's maximum refresh rate at your chosen resolution, and more importantly in some areas your FPS may drop by as much as 50% or more if the graphics card has to wait to display a whole frame. It is explained more clearly on this page of the Gamer's Graphics & Display Settings Guide. Wait for Vertical Sync: Vertical Synchronization (VSync) is the synchronization of your graphics card and monitor's abilities to redraw an image on the screen a number of times each second, measured in Hz. Note that enabling Motion Blur does reduce FPS slightly, but ultimately you should decide whether to use it or not based more on how you feel about its visual impact, and bear in mind that it can also help cover up the shimmering from jagged edges in the game.
A comparison is provided above however this is a difficult effect to capture in screenshots. Motion Blur: If set to Yes, this option enables Motion Blur, a form of effect most noticeable when you change your view rapidly the resulting slight blur in the image may improve visual quality and realism for some people, while others may find it distracting.
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