There are commercially available video cameras that can record at 100s of thousands of FPS, and scientific cameras in the millions of FPS. Yet the fastest monitors are around 500fps. Of course, there is much more utility to a fast camera than a fast monitor, but I get the sense that there are also technical restrictions. Why has no one made a 1 million FPS monitor to show off as a tech demo?
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HDMI category 3 for 4K at 120 Hz uses a 48Gb/s data connection. The fastest fiber connections are 100Gb/s, which might get you 250Hz for 4K. Look at the price of a 100Gb/s ethernet card, and figure out why no-one wants to make such a monitor. DisplayPort is slower.
That 500Hz monitor is 1080p, and the HDMI is still 48Gb/s.
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