Script.aculo.us and Safari

I am not sure if it’s because script.aculo.us developers use Safari, or because it’s javascript complier is better, but the script.aculo.us Effects run much smoother on Safari than they do on Firefox. I do most of my work on Linux, however at work I have an older eMac sitting there for testing, and hands down, Safari executes the Effects from script.aculo.us much better. Firefox on both platforms has the tendency to chug just a little when an animation is working. Someone better at JS than me should look at that :)