In its effort to improve the performance iOS 4 on the iPhone 3G and second-generation iPod touch—the oldest and not coincidentally slowest devices supported by the new OS—Apple has removed the ability to sync Notes over-the-air for those devices in iOS 4.1. Geek.com points to an Apple Support Document that confirms the feature is no longer available on the iPhone 3G and iPod touch 2G, and suggests that users who saw their Notes disappear…