I've recently installed Lightroom 5 on my new PC and everytime I make any alteration in develop the image goes blurred for a couple of seconds, which is making it very difficult to edit! I didn't experience this problem when trialling Lightroom 6 on the same PC. Any suggestions on how to stop this from happening?
What version of Windows are you using?
When was the last time you restarted the computer?
Where is the LR catalog file stored?
I'm using Windows 10 with the catalog stored on my PC's internal hardrive.
I restarted the computer about 1 hour before having this issue, however I have just restarted again and LR seems to be functioning now.