Please bear in mind that PC gaming encompasses thousands of hardware, software and driver configurations. It's frustrating to experience performance issues in any game, but not generally an indication that the particular problem is universal.
This has nothing to do with hardware configuration. The game has a universal problem with its mouse input. It is absolutely awful and worse than Mankind Divided.
The frame pacing issues make this game a jittery mess when playing with a mouse. The only way to have a completely smooth experience when looking around is to use a controller.
As soon as your framerate goes below your set refresh rate the game jitters like crazy. GSync or no GSync.
So has it been confirmed that the 64-bit Skyrim SE will support more than ~255 mods? Also, does it utilize RAM and VRAM better than the old version?