Under the leadership of Vishesh Handa, Nepomuk has been focused on performance and stability. With KDE 4.11, for accelerating writes/indexing, there is new graph handling to speed things up compared to earlier releases. However, now there is also read performance improvements by removing the local socket communication between applications and the storage service.
Vishesh Handa has written about the Nepomuk speed improvements for KDE 4.11 in a new blog post as well as an earlier posting.
A speedier KDE Nepomuk is just one of the many new features for KDE 4.11. This is also going to be the last release where KDE4 Workspaces receives new features.