Since I store 95% of all my different catalogs on external drives, I can say the brush lag is there regardless, but that it seems as though, as I go along, that LR is constantly writing updates to the disk drive. The drives I use are all USB 3, though some are straight drives while others are RAID, including RAID 5 which is somewhat speedy. I did read that Adobe is basically recommending NOT using Lightroom for many corrections or brush strokes. I do find the more I do in Lightroom, the slower it is and the more lag it displays. I still find it odd that Camera RAW does not display this issue. I think it’s related to LR writing each and every change to the drive every time you do something. Sometimes I sit for a while to wait till all the writing is done and then I see the lag subside. I find it interesting that Capture One 11 does NOt display any sort of brush lag with its layers and brushes. I still prefer LR, including color rendition, but C1 seems to have implemented things pretty well.
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