I've been using XMind for about 3 years. I write down a lot of information in it, which causes the file to become quite large. After a while (>1000 nodes) everything becomes slow - loading, saving, browsing the tree. At some point XMind has an "out of memory" problem, and I must create a new file, and juggle between them. That is annoying.
Is there any scalable mind mapping software out there? Preferably free, but commercial is fine.