I've just purchased a new system to replace my 6yr old i7 920 pc on win7 64. My machine was well setup and ran great. However, age was catching up even with ssds and 24gb of ram. I backed up the disks and partitions onto 4 separate external drives in case I suffered failures during the migration.
My new machine was bought and installed with Win 8.1 Pro onboard with the free upgrade also factored in. It took me just over two days to migrate to the new machine and restore all my settings, drivers and profiles I had built.
Once I was satisfied that 8.1 pro was setup correctly, I decided that since it was new and downtime was being factored into the upgrade that I may as well bite the bullet and do the upgrade. I downloaded the iso and ran it from within 8.1. A half hr later, I was up and running.
The first issue was my NEC MultiSync LCD2690WUXi2 and Eizo CG277 weren't recognised correctly. I have a Quadro K2200 video card. I went to the nvidia site, updated to the latest driver and that was solved.
My 2nd issue involved my Wacom Intuos Pro 5 tablet where I was unable to grab the sliders and move them. I could tap them and move like that but not grab and move. I eventually found something called Use Windows Ink in the driver. I disabled that and it worked fine.
My 3 Samsung SSDs, 1tb (OS, Programs etc), 500Gb (LR Catalog) and 120Gb (System and PS swap files) are working fine.
The onboard raid with 4x4tb WD red drives is fine.
I now have a minor issue in Win 10 which occurred in 8.1 where my main LR (2015.1.1) window is on the Eizo which is set as Monitor 1. Monitor two (the NEC) is set as the main display. Now, with LR on the Eizo, if I select say a collection, that will cause LR to flick to monitor 2, The main display which is NOT what I want, I need to keep dragging it over to the correct window. This is a bit annoying and haven't discovered a cause yet..
I have all programs up to date and working.
PS cc is installed and 30 bit support is enabled. I synched all the settings from my old machine to the cloud, I now have synched them down to this. The only thing that didn't synch were my colour settings so I did that manually.
LR has recognised all the old print settings etc which is good and was something I was concerned about.
My Xrite i1 Pro2 is up to date and all the software is working. I brought my data from the old machine such as measurements, profiles etc and they are all ok.
Colorthink pro has installed fine and working.
The NEC spectraview and Eizo ColorNavigator software is working fine with no glitches and is up to date.
I was led to believe that LR6 didn't make use of all available cores in the chip. I imported a thousand raws from my Canon 5Dmkii as a test. I had the onboard usb3.0 cf reader read the card. I imported them as Convert to DNG on import. I opened resource monitor to watch what happened. The import status showed that files started coming across. I then immediately had the Convert to dng status indicate that it was working straight away and NOT waiting for the import to finish. The resource monitor showed my i7 5930k (6 cores, 12 threads) chip with 64gb was utilising all 12 at around 75% utilisation. It was very quick compared to my old i7 920 with 24gb. After the import staus showed the import had finished and only the conversion was occurring, the utilisation dropped to around 40?%.. This was really a lot quicker. I didn't perform this test though on 8.1, only Win 7 64 with 24gb and win 10 with 64gb.
Backups of around 1.5Tb which took around 24 hrs on my old machine now take around 3 hrs. How much is down to Win 10 though I don't know.
Overall, I think the upgrade from 8.1 to win 10 is worthwhile. It just seems very much like Win 7 with which I was very comfortable. I think overall, MS seem to have gotten this right.