Lethargic adjustment brush with auto mask on

Hello everyone ...
I am a new to this forum. I've been hanging out as an observer and have decided to get my feet wet with my first posting.
I'm a wedding photographer and have been a Lightroom user since the first beta release and totally love the program. I am using a mac G5 dual 2.7 with 6 GB of ram. Up until release 1.4 Lightroom has been great.
Release 2.0 has been another story. I have installed all updates including the newly released 2.1. It appears there is still an issue with the adjustment brush. If I use the brush without 'auto mask' the brush flows smoothly. As soon as 'auto mask' is engaged the tool becomes useless. The flow is slow and choppy, plus I have to contend with an almost constant spinning beach ball.
Has anyone else been experiencing this problem? Is there a fix? Or, might this be an issue that Adobe is still working on.
Sorry for the long post, just wanted to introduce myself and any help with this issue would be most appreciated.
Thanks ... Fred

From the Known Issues sections of the release notes:
>We are still working on additional methods to improve the performance of the new Localized Correction features.
As you've already observed, leaving the Auto Mask off is the best way of avoiding poor brush performance.

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Lethargic adjustment brush with auto mask on

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