I just upgraded from 9.10 to 10.04 and it is nearly impossible to use now because of just sheer SLOWNESS. Karmic ran fast and flawlessly with multiple applications open at once, but after upgrading to Lucid it can take several seconds (10-15) to complete even the smallest tasks like opening the gnome menu. Scrolling in firefox is especially slow (and annoying). Compiz as well is not usable due to slowness.
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