Slows down gradually

Hey, @rno. Welcome to the Lightroom Community. I'll need more information to help you figure this out. What troubleshooting steps have you tried already? Do you know if this happens with a specific set of images in a specific location? 

Please share more details about your workflow and the system info from Lightroom. Go to Help > System info, copy and paste it into a text document, then upload and attach it here along with a few screenshots or a short video. Right now, the information I have is too limited to help you.

Check this recent conversation: 

Thanks!
Sameer K
(Type '@' and type my name to mention me when you reply)