Flex code completion and highlighting unusable in mxml script blocks

Using build 92.105, it can take IDEA 10 - 20 seconds to offer code completion suggestions when in an mxml script block. Highlighting takes about the same amount of time to appear. IDEA 9's performance has degraded quite a bit for editing code in mxml script blocks.

I'm running on Mac OS X 10.5, although a coworker of mine running on Windows experiences similarly poor performance.

Stephen