Upload & Sell: On
Delete preferences file
Make a new Catalogue
Move your Cache onto an SSD
A workflow 'fudge' is to set all noise and sharpening to zero and perform this step last
A less satisfying fix is to also maximize the size of the control panels (i.e. reduce the size of the main image window)
Change your platform if possible to an i7/Xeon or whatever but thats no guarantee.
For me the real fix was increasing the performance of the memory controller in the BIOS but you cant do that on a normal Mac unfortunately.
I've done extensive searching trying to fix my LR4 speed issues, but am still coming up empty so I thought I might try coming here.
I'm running LR4 on a 6-core Mac Pro with 24GB of RAM. I have all the images locally on my 2TB (not SS) hard drive, which is only half full. I've done ALL the optimizing that Adobe suggests...optimizing catalogs, rendering 1:1 previews in advance, etc and LR4 is STILL more than 2x slower than LR3. Just to clarify, I'm working with all RAW files.
It's not a cache problem, because I have LR3 and 4 caching into separate folders, the cache is large, and I purge it often.
Trashing and regenerating previews does not help. I create a new catalog for each wedding, so catalog size is definitely not a problem.
Both LR4 and my OS/software are all updated. If you have any ideas, please let me know!