I'm wondering if I'm alone here because I've used IDEA since version 4 and at this point I'm very close to uninstalling IDEA.
For reference, one of the projects I work on includes 220,906 files and 47,505 folders. In version 8 the initial indexing took a very long time but once it was complete the IDE was generally very fast and features such as the project window, refactoring and autocomplete all worked very well. The only pain was when IDEA needed the occasional restart once every few days or weeks.
With 9 the occasional pain from indexing was better, however everything else which was arguably far more important was more painful. It seems our pain points lie in things that would use indexes, like autocomplete, refactoring and the CTRL+N/CTRL+SHIFT+N (I've been using it so long I don't remember what it's called, I just remember hot keys). With 10, and in particular 10.5, it's become virtually unusable. Startup is extremely fast but the autocomplete quite often locks up for so long that we give up on waiting on it. Likewise opening a package in the project window also often results in a lockup for several seconds or even minutes if we have not touched that package recently.
I see this across multiple machines and projects. The small projects work well with all the features, anything large and it's quickly becoming unusable as an IDE where it worked perfectly fine (after a long startup) as recently as version 8. I've tried a myriad of VM options along with both the Sun JDK and the JRockit JDK.
Any suggestions are welcome...