(note the following article is ported from an older site of mine, and may no longer apply to newer distributions of Ubuntu)
Mice manufacturers may advertise high-end mice by tossing around DPI numbers as high as 5700 these days, but as long as you’ve got something that can do 800-1600DPI, poll rate is more important. Unfortunately it seems Ubuntu (Karmic 64bit, 2.6.31-19 kernel) had mine set to automatic or default, which is less than the 1000Hz my good old Logitech G5 supports. Read on for the fix.