How to optimize text editing performance in Flash Builder 4?

I am running Flash Builder 4.0.0 (build 272416) on a Macbook Pro 2.4 Ghz with 4Gb RAM. I am experiencing extremely poor performance while simply editing moderately complex MXML files.
By poor performance I mean noticeable lag between keystrokes. Type one char, wait 2 or 3 seconds on a 700 lines MXML with about 20 buttons, 2 AdvancedDataGrids, 1 text area. Fairly complex, but that's what I need.
Opening said MXML file takes around 12 seconds.
Saving said MXML results in around 8 seconds: no automatic building, nothing else being done.
On trivial MXMLs there's still a noticeable lag while typing, around 0.5 seconds per char.
At this point Flash Builder 4 is unusable for me: editing .as files is still decent, but for MXMLs is almost impossible to work with, as you can see from the numbers above.
Is there *anything* I can do to improve text editing performance? I've disabled all sort of niceties (automatic completion, indentation and so on) in the prefs, sadly to no avail. This is a major inconvenience for us.

You understood correctly:
- I removed all Build Path > Source Paths
- I moved those paths over to Library Paths > Source attachment
I took inspiration by how the Flex SDK is added to the project. Flex and flex related frameworks (e.g. datavisualization lib)  also specify a Source Attachment under Lib Path. If I remove the source attachment I am not able to drill down into Flex code when I want to by Command-clicking on a class name (or hitting F3).
All my SWC are open source. BTW some of the source paths I was using were the path to the Flex code and to datavisualtization lib, which I think are the biggest library I am linking against. So maybe to recreate, just add those 2 libraries and make sure to add the source path AND source attachment.
I am using RSLs for every library if that matters.
I don't understand why specifying a Source Attachment would cause any issues...  the swc is in sync with the source specified in its source attachment.

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