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Vertical Sync improves video display quality, especially on motion (see this article for details https://en.wikipedia.org/wiki/Screen_tearing)
But it requires more resources, so if your system is already at the limit, you may consider disabling Vertical Sync (or setting it to half refresh rate - only availlable for Nvidia)available for Nvidia)
Flux plugins note
On some computers when using NVIDIA graphics cards, you may encounter issues with white GUIs or crashes.
As Flux:: plugins require OpenGL 2.0 to work, you may have to allow or force your DAW to use your Nvidia graphics instead of using the onboard Intel graphics chipset.
To do this, open the NVidia Control Panel, under 3D Settings, click Manage 3D Settings, then Under Global Settings, change the Auto-selection to High-Performance NVIDIA processor, as a preferred graphics processor, and then click Apply.