Wow...I just got my 1Dx in May and it meets the criteria to have an issue. I'm not too worried about it just yet.
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Custom built rig:
Win 7 64bit
i7-960 running at 4.16Ghz x4/8HT
24 GB RAM
Samsung 830 256GB SSD
CS5 runs just fine no issues... LR4 run like a Dog... I am out of ideas how to speed up LR4 apart from switching off the HT cores.