Seems to run fine, although I've only used Word and Excel so far. It takes a little while (as in 6-8 icon bounces vs. 2 🙄 ) to open the first time, but after that it's much quicker. I've heard that importing large images takes a while, but we're still talking "comparable to G4" speed. In my limited experience, everything else is actually quite snappy. Faster than the 1.33ghz ibook G4 I just sold. For simple stuff, it actually seems to run about as well as it did on the 2.0ghz imac G5 I also just sold.