I've tried a multitude of things: GPU: On/Off Render: Minimal, Standard, 1:1, Embedded Convert to DNG: Yes/No Preview Cache: Increased Do I wait for previews to be rendered? Absolutely, LR is slow enough without trying to work while previews build. The slow downs are almost always in Develop mode. They're worst after editing a few images and performance doesn't improve until closing LR and actually waiting for LR to die in the task manager, which is another 30 - 60 seconds after being closed.
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