Why is Ubuntu 11.10 so slow?

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http://askubuntu.com – I've been using Ubuntu since version 6. I'm a big fan. I upgraded to Ubuntu 11.10 a while back. I did a clean install. Ever since then, my laptop's been generally slower. The GUI is generally laggy. I know you'll ask "Slow compared to what?" It's slow compared to Ubuntu 10. And it's much slower when compared to Windows 7 on the same system. I'm using a Dell Latitude E6400, with a 2.4 GHz Core 2 Duo CPU, Nvidia Quadro NVS 160M, and 6 gigs of RAM. I have a high speed 1 TB disk, with plenty of empty space. Has anyone observed this? Are there any people out there with the same hardware (HowTos)