jerky stop motion video, dropping frames after upgrading from win7

One thing I will say ...

As this system is used as a Media centre i am assuming that it has direct access to a lot of data, you has to consider that any modern OS, (I consider any Windows from Vista onwards as modern as this is where the design changed), has a lot of "housekeeping to do at the beginning (after initial installation). The majority of this housekeeping is related to the search indexes, If you are using a Microsoft based playback solution, (that accesses data and information from the File system) this information is essential for you enjoyment of your media. If your system is one that contains it's own database then you will need to wait for this to populate but could probably switch off the Windows Index system.

This Housekeeping phase can take a while, (hours to days dependent on data amount involved), also as this housekeeping is set to only occur when the system is idle, it is best practice to switch on the system and leave it running but unused for a while ( I normally let it run at least overnight)

After this period ( check the disk activity light if available) you will have a better idea of the capabilities of your hardware - If you are streaming from the Net then the download speed needs to suitable for the media - minimum 2MB/s for 1080 HD and 8Mb/s for 4K. For local playback you need fast hard drives, 7200 RPM+, with a reasonable amount of free space

Obviously the Graphics card will affect the playback but for 1080 HD the load is well within the range of most medium level cards / chips 4K and above may need an upgrade

The overhead for the "Bling" of the display on Win10 is actually less that that used on win7 to support the Aero Interface

Not sure if you did an upgrade or a fresh install, one thing is that upgrades from Win7 to Win 10 are known to show some strange issues at times so a fresh install may be worth a try if not already done. ( you now have a Digital licence so should not have any issues with re-activating)

Also you may try using DDU to completely clear all traces of the old driver then install the latest driver from the nVidia Site, ( never use the bundled windows driver if possible as it is often slightly les specific than the one on the nVidia site)

Not a gamer so cannot comment directly, but, as the link you quote is concerning the Creators Update 1703, which has been recently superseded by the Fall Creators Update 1709 that contains corrections to solve the problem I would not expect this issue to be what you are seeing, unless you are running the older version, ( 1709 was only released in the last couple of weeks )

The recommended system of many forum members here is to use System images (Using Macrium Reflect Free), rather than the Windows old method as a safety net. as this does not have any cut off date and is frankly a lot more reliable'
if your video store is on a separate partition or drive you could take an image of this for backup purposes, but a fresh install will not affect other than the system Drive / Partition, so should not be an issue ( a separate drive or partition and using the "location" tab on the properties of the User Folders is my preferred way of managing data whilst allowing windows to work as designed ( I use SSDs for system drives so do not keep data on these if possible)

To find out which version you are running press WinKey + R and type winver or click on the start menu and tpe winver

To get the latest Windows take a look at How to get the Windows 10 Fall Creators Update - Windows 10 Forums which is a large thread here giving a lot of information - luckily most of the pertinent information is in the first post