Performance problems (especially in macs) Follow
There seems to be some major performance problem which affects especially mac users. The problem causes the editor to freeze frequently for seconds and it is maybe most notable when a file is edited the first time. The freeze happens for all edited files (scala or nonscala) when scala plugin is enabled. The problem has been in the plugin for a while (it is present at least in version 0.2.22103), afaik the newest version that does not suffer from the problem is 0.2.21256.
Please let me know, if there is anything I can do to help fix the bug.
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One possible improvemt for now, which can you do, is to switch off Navigation bar (View -> Navigation Bar). This bug will be fixed (I hope) to IDEA 8.1.
Second problem, which we have, is lexer. So we'll try to fix it. And note, if you work at the end of file it will be much faster.
This problem now fixed. You need to wait new plugin version. (now you can use simple workaround with navigation bar).
This is great news!