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Can a human eye perceive a difference between an image that takes 150ms to load and another image that takes 160ms to download? If a page has 30-40 images, then does this 10ms difference start making a difference?
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The fastest rate at which humans appear to be able to process incoming visual stimuli is about 13 ms. Receiving a stream of data faster than this will only underscore the limits of our perception. 2. Increasing latency above 13 ms has an increasingly negative impact on human performance for a given task.
However, a team of neuroscientists from MIT has found that the human brain can process entire images that the eye sees for as little as 13 milliseconds — the first evidence of such rapid processing speed. That speed is far faster than the 100 milliseconds suggested by previous studies.
Some experts will tell you that the human eye can see between 30 and 60 frames per second. Some maintain that it's not really possible for the human eye to perceive more than 60 frames per second.
10 ms might be just barely noticeable. On a typical laptop with a refresh rate of 60 Hz, each frame is on the screen for about 16-17 ms, so (all else being equal) a 10 ms delay means a roughly 66% chance of making the image show up one frame later.
However, a 1-frame delay (which is the maximum delay possible as a result of this) would in all likelihood not be noticed by most users. It would be very noticeable for animation, but not very noticeable in terms of when the static image appears.
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