Speed & Performance and other problems!!!!

Hi there,
I have had my Mac Mini for about 9 months now and within the last 2 weeks there has been a significant drop in speed and performance of it. Booting up seems to take forever compared to previously and very often when I am in the middle of doing something it freezes, i get the rainbow wheel, and have to wait for a little while for it to start responding again!! I think that this started shortly after I had another problem (wasnt booting at all!!) where I was advised by Apple Support to reset the PRAM.
What I have done so far:
- Checked the free space; I have around 8gb of free disc space
- Run YASU; after reading previous posts I ran this program
- Repaired disk permissions and verified the disk.
Does anybody have any further suggestions.....its driving me crazy!!?!!
There are 2 other key problems that I have with the Mini that are more of an annoyance than anything else, but none the less would be good to get some advice:
- Sometimes (Intermittently) there is no sound device showing on the mini; if I look in the device's it just says that there is no sound device connected!!?!
- Also when putting many CD's in the mini it does not play it and then will not eject the disc until i restart!!
Any help would be very much appreciated!!!
Ta

If you haven't already, you might read this performance FAQ, which may help: http://www.thexlab.com/faqs/performance.html

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    Hi (support),
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    It is not a hardware issue.
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    A version 4 product should work as advertised. Keynote certainly does not.
    I'm deeply saddened that Apple seems to have become an iPod entertainment company, interested mainly in profits from entertainment rather than serious useful technology.
    On 2007-Oct-19, at 10:14 AM, (tech support) wrote:
    Hello Sir,
    Unfortunately, this does look like it's mostly a case of some of the new Keynote features slowing down the performance on the PowerBook.
    At this point, there isn't much else we can do in the way of troubleshooting.
    If you are not satisfied with the performance on the PowerBook, using the previous version of Keynote is probably his best option at this point.
    We will continue to research this issue, but at this point it's unlikely I'll be able to find additional suggestions for improving performance, as it looks like it is is reproducible and limited to older models.
    On Oct 16, 2007, at 11:27 PM, Ron Tucker wrote:
    Hi (support),
    Thanks for your recent followup calls. I'm directing a video shoot so am a bit preoccupied.
    Here are the tests I mentioned.
    These are as simple as it gets, and I think highlights the synchronization problem with Keynote.
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    This demonstrates a dramatic synchronization slippage.
    The visuals occur before the click (and audio) markers. Keynote seems to be create delay in audio at each "record and replace" point. This accumulates as the audio is revised in successive slides.
    These tests demonstrate that there is a fundamental flaw in how Keynote handles audio in its most basic application.
    This does not address the slim toolset available, such as lack of insert capability and other basic audio tools, which is a separate design issue, and I suppose subject to "request for enhancement" feedback.
    I've reluctantly abandoned Keynote for my project work at present until these basic issues are addressed and it can be demonstrated that Keynote can successfully execute its feature set.
    <TuckerKeynoteTest.zip>
    Message was edited by: Ron Tucker1

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