When even doing the simplest things in Lightroom Classic, like adjusting exposure, my CPU hits around 300%. It always lags a bit. When using the crop tool, or adding masks, I have to wait a second or two most of the time.
I'm running OSX Monterey on an iMac 2017 (27", Retina 5K). It has a 4,2 GHz Quad-Core Intel Core i7 processor. 24GB RAM. And a Radeon Pro 575 4 GB graphic drive. I have the latest version of LR installed. I have "Use graphics processor" set to Auto and Camera Raw Cache set to 20GB. My catalogue and previews or stored on my local HD, while my raw files (around 100MB+ each) are stored on an external drive connected with Thunderbolt. I recently upgraded to mirrorless cameras which or around 50-60MP. I'm sure the files are much heavier to handle, so that might be the reason why LR is so slow with me recently.
Can anyone tell if my iMac specs are too low to work with these kind of files? Should I upgrade my system? Or would it be somewhere in my LR settings? Any other suggestions?