So, it would seem to me there is a bug in the way the Develop Presets are being indexed in Lightroom. I reduced the number of presets to less than about 100, and the performance increased INCREDIBLY and INSTANTLY. I read on a forum that the number of Develop Presets could affect performance, so deleted the majority of them (backing them up first) to see if it would make a difference. This occurred whether I had 10 images or 10,000 images in the catalog (I tested various scenarios). I run Mavericks 10.9.2, so it's not a matter of an out of date OS. On my iMac 3.4GHz with 32Gb RAM, NVIDIA GeForce GTX 680MX with 2GB, and 1TB Fusion Drive, the CPU would go over 100%, while the disk and memory allocations were low. Having performed some troubleshooting, I discovered the reason for the slowness was a CPU spike.
When a large number of Develop Presets are loaded into Lightroom (in my case, over 500), the Library Module, and strangely, to a lesser degree, the Develop Module run very slow. I've found a solution to a problem many others seem to have reported - but it does involve a work-around, suggesting the Adobe Photoshop Lightroom team need to fix a bug.
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