CS5 RAM preview is slow if I do other things while it's building

Good morning!
I'm experiencing a strange issue.  1080/29.97 comp on an 8-core w/ 16GB.  Multi-proc rendering is off.
If I RAM preview the comp (800 frames or so) and wait while AE builds the RAM preview, it plays back fine & at speed.
If I start the RAM preview, then go work in Photoshop while it's building, then return to AE and attempt to play it down, I have the green bar like a normal RAM preview, but it plays very slowly -- almost as if it's re-rendering every frame (actually slower than if I just hit spacebar to render&play on the fly).. maybe 1fps.  If I stop and play those frames that it's slogged through, they then play normally.
Is it possible that RAM previewing while I'm using another app (e.g., Photoshop) is resulting in the frames being written to swap disk or elsewhere so that they're being re-read into RAM when I actually try to play it?  Disk caching is disabled in the AE Prefs, but...?
Thanks in advance for any ideas -- very annoying.

> Is it possible that RAM previewing while I'm using another app (e.g.,
Photoshop) is resulting in the frames being written to swap disk or
elsewhere so that they're being re-read into RAM when I actually try to
play it?
Yes. That is possible.
Be sure that you're reserving enough RAM for other applications.

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    The only reason for upgrading from CS4 -> CS5 production suite was the use of all my 8GB RAM in AE and now AE can use it but when it's using it the audio have issues.
    CS5 is on the market for nearly a year and still have such essential issues... And my fear rises there will be no valuable update fixing these issues but instead Adobe forces me to upgrade later this year to CS6 in hope something change...
    I have had support request for different Adobe products in the past including telephone support, web support via Adobe ID... none with success the web support answered my request 3 weeks later with the message they will look into it... time went by and in the end the result was "Yes we know it's a known bug" the bug did not get fixed for that CS version. it even exists in the next major CS release! (talking about EncoreDVD here). Once the web support answered weeks later when I was in holidays and after some days I was not able to respond they closed my case. I reopened the case but never got an answer! Telephone support is nearly waste of time because in 95% of all cases it does not help to reinstall the whole operating system and talking to people who know less about computers in general or Adobe products then my mom - it's a waste of time.
    I don't want to blame here anybody for things happend in the past I just want to point out that this time I choose an other support channel (bug report and forum post) but it seems that this support channel is also a waste of time after 1 month with no valueable feedback!
    I bumped up this post 2 times and thanks to craulmedia for the third time.
    And now here is my fourth time *BUMP*
    All I got so far is: "I saw your bug report it's in the queue"
    Is it still in the queue? which queue nr. does it have? how long will it take to get any answer? is it reproducible? Is it confirmed as a known bug by Adobe? Is Adobe working on a fix? When will this fix be available? Is the fix provided in form of an update or in the next major release?
    OK, I know this is a user to user forum and Adobe people only stop by in their free time and there is no guarantee for any real support.
    But it started out so good in the first time...
    Last 2 things I want to add here:
    1. Why should I provide my email in the bug report? Sure so Adobe can get back to me for further information... but wouldn't it be nice if Adobe would be so kind to give some status report to that given email as a small present for the enthusiastic beta testers ?
    2. please Adobe take a look at www.uservoice.com already Autodesk started to move there with 3ds Max.

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