Has this happened since you started using Nik software, or have you been using Nik software previously and it has run ok? I know that Nik software does take a while to do it's actual adjustments but if you aren't actually using the Nik plug-in, then all other operations run normally. I think it is just a Nik thing. I am using a fast computer and Nik does take up to a minute to run through it's adjustment and once done all runs fine.