Adobe Lightroom 5 on Mac suddenly is running very slowly

Very often, when I open a photo, it takes quite a while for the image to be rendered, and I see the message "Loading" as I wait. This is especially annoying when someone is at the computer wanting to see my work.

What should I look for that could be causing this slowdown?  
When I have this slowdown problem I turn off nearly all of my other programs.
Thanks so much!  

Here are my specs:

Lightroom Version 5.3
iMac 3.4 GHz Intel Core i7
16 GB Memory
Mac OS X 10.7.5

Lightoom files and catalog are on a Promise Technology Firewire 800 RAID DS6400
4 - 1 TB drives

I have run the control software for the raid, and it shows normal activity - no rebuilding is happening.
I  DO  have several other FW 800  hard drives attached to the chain
I have a few USB devices, with 2 USB hubs.

I ran a software program, MainMenu Pro, which cleared all the caches, repaired permissions, and performed a whole series of maintenance tasks.

I have 325,000. photos in LR even though that is a lot of photos LR's performance is usually quite good.
My catalog size is 3.72 GB
computerlarryAsked:
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strungConnect With a Mentor Commented:
How much free space do you have on your internal hard drive? I suspect the Lightroom scratch files go to your internal drive. There may be a problem if there is not enough room for them.

Also see this Adobe KB:

http://helpx.adobe.com/photoshop/kb/optimize-performance-photoshop-cs4-cs5.html

You could also check Console for errors and check the integrity of your disks using Disk Utility or the utility for you RAID.
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