I am currently operating Lightroom Classic CC 7.4 on my iMac 4 GHz Intel Core i7 with 32 GB of ram OS High Sierra. Lately, my LR has become very unstable.
When trying edit in LR using the brush tool (K) I get constant beach balls. to the point of uneditability. I can't draw a straight line anymore without a beach ball right in the middle of the stroke. and at least 50% of the time now while brushing The program crashes. This also happened in the last version of LR. please help.
This is a well known problem in Lightroom, that lots of brushing causes slowdowns and other latency. Same for doing lots of spot healing. If you are going to do a lot of brushing and/or a lot of spot healing, you might want to try some or all of these steps: