Resizing a large image(86400 x 43200) into smaller tiles

Hello,
I am working with a VERY large image (86400 x 43200). I need to resize this into smaller images (7200x7200) the fixed size crop tool is painstakingly slow, is there a plugin or automation script that will do this for me?
My system should be able to handle this:
Phenom 9600
XFX 5770
4gb DDR 1066
Windows 7-x86
Photoshop CS4
Any Help would be greatly appreciatated!
-James

You may be able to change that behavior by adjusting the amount of RAM you allow Photoshop to use in the Edit - Preferences - Performance dialog. Keep in mind you'll need to shut down and restart Photoshop after having made a change to the setting.
-Noel

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Resizing a large image(86400 x 43200) into smaller tiles

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