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Make sure that hard drive / drives have sufficient free disk space for storage and swapping data. A good bench mark is a minimum of 25% as you will see a drop in performance as the available free space reduces. e.g. With a 1TB HDD you should have at least 250 GB available.
Even when going to an empty drive the problem persists, and still cause problems with concurrently working while imports or exports are in progress.
Have your photos gotten larger (because of a new camera)?
Are there other programs running in the background?
Is your antivirus interfering? (Try temporarily disconnecting from the internet and turning the antivirus off)
Image size has remained constant for a couple of years now. Not sure about the anti virus but I have been using the same one for several years and keeping it up to date. One thing I have not tried though is to move them off the sdhc or xqd card via windows transfer and then import at their location. I suspect this may end being faster though it is certainly much more of a hassle
so with a 5tb drive performance starts turning to crap with more than a tb free space? I can see if getting down to the last 250mb performance problems but not based on a percentage.
Not sure about the anti virus but I have been using the same one for several years and keeping it up to date
You should still try the experiment of turning it off.