Simon Garrett wrote:
So it keeps all it's preview files in LR then, that doesn't seem very economical.
But it does give much better performance in Library module as a result. And besides, on my machine my image files take 450Gbyte, the previews take just under 12G, or about 3% of the size of the images, which is approximately nothing!-- hide signature --
The preview cache is also "aged" and previews fall out after awhile.
See catalog preferences