One of the main reasons I decided to switch to the beta version of Ubuntu Raring is nautilus performance. Nautilus is the default Ubuntu file browser cum manager. The version installed right now in 3.6.3. Compared to the performance of earlier versions it is definitely much faster. Though it may never reach the speed of PCManFM, there’s definitely a significant improvement for nautilus. The look and feel has changed to some extent in the toolbar options.
But what I still hate about nautilus is the crap logic of its crap developers to use 1KB = 1000 bytes and providing no option to override it.
Now you can get rid of this abomination and use Nemo, the fantastic default file manager from Linux Mint. Instructions for minimal install here.