I notice this today which I download the latest Aptana and run it under Fedora 18. It’s very slow and every time opening a new file, I got “creating file buffer” notification and takes like 1-3 minutes to finish. Then I realize the problem because the Java version I use.

In Fedora 18, by default it will using OpenJDK which caused this slow opening file issue. To solve this problem, we just need switch into using Oracle Java version rather using the OpenJDK.