FarmVille and Zynga have added in a new popup tonight that will allow the game to store extra tid bits on your personal computer in order to let the game load faster! Safe? I am sure it is, Zynga would have no real reason to dump bloatware into your computer or viruses. What exactly are they putting in there? Well, thats not known for sure but I will go out and say it will probably be Adobe Flash mechanics since it is an adobe feature. The feature is known as the Global Storage Setting, and you can see what yours is set at here.
Questions: Have you used this feature? Is it really helping your game load faster?