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We're sorry for a bad experience with Lightroom, let us help make this right. Could you please let us know which exact version of Lightroom you're working on and which operating system are you using?
Also, could you please have a look at this article and let us know if it helps? Optimize Lightroom performance
High Sierra 10.13.4 (I mention already I'm using the latest version)
I've followed everything in the optimisations recommendations with no improvement.
I've since downgraded to LR 6 which is far more responsive, but forced to go to 7.0 as it didn't support my Olympus ORF files. LR 7.0 seems much faster.
Hi...no reply ?
I edit pano images that are that size all the time on Lightroom including 7.3 on a Mac Book Pro from 2012. This one has 16 gigs of memory 1GB of video RAM on the card and a 1TB SSD and runs high Sierra. Edits are certainly faster than slider updates every few seconds as soon as Lightroom has loaded the actual image (takes a few seconds). So your much newer and faster machine should be able to do this easily. Lots of reports here and on other fora though of Lightroom 7.3 running slow on the latest and greatest machines - both windows and Macs. Very strange.