At least for me and my project.
It uses lots of generated code that need to be part of the project for compiles to work.
The generated code is use created using Ant outside of IDEA. When I switch back to IDEA I have to wait too long and endure many repeated "file scanning" dialogs.
While my project might not be idealy organized, this performance makes using IDEA highly problematic for me.
This was better for a while but got bad again in 5581 when I posted "Project file scanning in 5581 beta not so good"
Are there any plans to address this issue, or it is something I'll have to try to learn live with?
I'd be happy to provide additional info.