Ever since I updated to 12.4.2 I am finding that it is taking 4-5 minutes for the masking feature in Camera Raw to select subjects and skies. I am also having this problem in Lightroom. I am running Windows 10 with the following specs so I don't think it is my computer and I haven't had this problem until this latest update. I have tried resetting my preferences; increasing the amount of RAM PS can use, and increasing the cache size, but none of this has helped. Does anyone else have this problem and, if so, how can I get it working properly?
Installed Physical Memory (RAM) 16.0 GB Total Physical Memory 15.7 GB Available Physical Memory 2.88 GB Total Virtual Memory 23.2 GB Available Virtual Memory 3.28 GB Page File Space 7.45 GB
Try resetting the Camera Raw preferences: Hold down the Command key and select Photoshop > Preferences > Camera Raw (macOS) or hold down the Ctrl key and select Edit > Preferences > Camera Raw (Windows). Click Yes in the dialog that asks "Delete the Camera Raw Preferences?" See also: https://helpx.adobe.com/camera-raw/using/camera-raw-settings.html
Author “Color Management for Photographers" & "Photoshop CC Color Management/pluralsight"