Fractional Scaling works for me after update.

NVIDIA Corporation GM204 [GeForce GTX 970]
Scrolling and 4K videos are very laggy in 125%, 150% and 175% mode.
Tested with:
- NVIDIA driver metapackage from nvidia-driver-440 (proprietary)
- NVIDIA driver metapackage from nvidia-driver-450 (open-source)

1 x 4K-Monitor (125%)
1 x FHD-Monitor (100%)

Used this command to see GPU usage:
$ watch -n 0.5 nvidia-smi

Watching 4k Video (120fps):
- no scaling: 25% capacity
- with scaling: 65% capacity (sometimes flickering and black screen)

No interaction:
- no scaling: 3% capacity
- with scaling: 6% capacity

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https://bugs.launchpad.net/bugs/1870736

Title:
  [nvidia] Screen scaling 125% gives 200%

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