Spotlight in 10.6 was much faster and responsive than Lion. Before I could press Command+Spacebar and start typing and the results started appearing as I typed. It was perfectly smooth. Now It is (a little) sluggish. It's not as responsive. Everything is already indexed and I upgraded from Snow Leopard (It is not a clean install). Could be because of the new Filevault2 (now it is whole disk encryption) affecting reading performance? In 10.6, FileVault encrypted only User's files. Maybe it is that? I'm using a macbook early 2008 (2GB RAM, 160GB HD).