Don't see changes in Live View until after 30 second delay

Running Dreamweaver CS5.5 on Mac OS X 10.7.5
Running Locally using MAMP
Site is configured to run on a local PHP/MySQL server, and consists of a single index.php file with nothing more than an html header (I don't even have any PHP in there yet).
When I use Dreamweaver to make a change in my index.php file (such as changing the text in the header), I save it, and then go to Live View or Web Browser Preview. In both cases, it takes over 30 seconds before I see my changes in Live View or Browser Preview.
To get a better idea of my workflow:
     1) My indiex.php file header reads "This is a test"... and it's correct in both Live View and Browser Preview.
     2) I change the header to be "Hello World".
     3) Select "Save" from the File menu.
     4) Click the "Live View" button.
     5) Live view still reads "This is a test"
     6) Open Browser Preview, also still reads "This is a test"
     7) I spam the refresh button in both Live View and Web Preview, no change, still reads "This is a test".
     8) After about 30 seconds of hitting the refresh button, the change finally is visible in Live View and Web Preview, reading "Hello World".
Anyone seen anything similar? Any ideas why I'm getting such a long delay before seeing my changes? Any suggestions to fix it (besides restarting my mac?

Thanks for the input!
Restarting the computer was the obvious first thing to try, but had no effect.
I have over 2GB free memory and still experiencing the issue.
It does take a few seconds to load the Live View for the first time, but that's not my problem. My problem is that with Live View already loaded, it takes over 30 seconds after saving changes to the php file before I can see the changes in the Live View (I'm clicking the refresh button once a second, and on the thirty something time I'll finally see my changes).
With "Preview Using Temporary Files" turned off, I get the behavior I've been describing.
Turning "Preview Using Temporary Files" on does actually mitigate the issue for me, though, so thank you for that suggestion!
     - I can see changes in my Live View instantly after saving and clicking the refresh button.
     - I can see changes using Preview in Browser instantly too... but the browsers refresh button has no effect (which makes sense since the temporary file it's looking at hasn't changed).
     - I can actually get some work done now.
However, I still feel that I should be able see my changes in Live View immediately after saving and clicking the refresh button without using "Preview Using Temporary Files", and I'd like to be able to leave the page open in my browser and just click the browser's refresh button to see my recently saved changes instantly.
So Long Story Short:
     Using "Preview Using Temporary Files" has definitely helped!
     But I still have no way to see my changes immediately without using temporary files, so something still seems fishy.

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    With "Preview Using Temporary Files" turned off, I get the behavior I've been describing.
    Turning "Preview Using Temporary Files" on does actually mitigate the issue for me, though, so thank you for that suggestion!
         - I can see changes in my Live View instantly after saving and clicking the refresh button.
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    So Long Story Short:
         Using "Preview Using Temporary Files" has definitely helped!
         But I still have no way to see my changes immediately without using temporary files, so something still seems fishy.

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    > How do i set it up so, like with plain .html pages, you
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    ==================
    http://www.projectseven.com/go
    - DW FAQs, Tutorials & Resources
    http://www.dwfaq.com - DW FAQs,
    Tutorials & Resources
    ==================
    "Major_Disaster" <[email protected]> wrote
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    news:gibqir$lgu$[email protected]..
    > Hello,
    >
    > Im trying to setup Dreamweaver CS4 with a php website im
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