The official Facebook app for Windows Phone 8 is now much faster thanks to a new update. The version 4.1 update doesn't bring any massive features but, like recent updates to the Android and iOS apps, focuses on improving general performance. We had a quick play with the update and found that it was noticeably faster than version 4.0, with none of the lag found in the old app.
Phones running Windows Phone 7 are not able to benefit from the new update. We're seeing the version 4.1 update in the UK Windows Phone Marketplace, but it doesn't appear to be live in all markets just yet. Let us know if you're able to download the update in comments.