Ubuntu 12.10 'Laggy'--can this be?

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http://askubuntu.com – This is a bit of an odd question, and I don't think 'laggy' is the right word, but bear with me. I installed Ubuntu 12.04 some time ago after a windows crash on a desktop I use from time to time; more recently I upgraded (note upgraded) to 12.10. Overall I am happy, it's clean, fun, simple and it works. I've been tinkering with it (12.10) a bit more lately, and then yesterday I put an old hard-drive into my computer and re-installed XP-Home on it (for particular reasons that only Windows can fulfill)--though Ubuntu will remain my main OS. I noticed while using XP today that in comparison, Ub (HowTos)