Something does not match my experience. IntelliJ IDEA is significantly slower than Eclipse. There was a blog explaining how to increase memory allocated to it to make it faster, but IDEA crashed when I did this (I have 8 GB RAM). I have thereby had IDEA Ultimate stay unused on my machine for the last two years or so.
We pay attention to any performance related problem found by our users and try to fix them as soon as possible. If you ever face this experience again I strongly recommend you to report it immediately so we can reproduce it and provide a fix for you.
Edit: used Eclipse for 6 years, but forced to switch from Eclipse because project grown to a degree that Eclipse can't open it properly (lot of maven cross-dependencies). Another thing: Eclipse 4.x really dropped quality bar - performance is terrible, unstable (compared to 3.8.x).
