Frametime and stuttering

[TLOUFoREVer]

Hi, So say my frametime is usally 8.5ms at 60fps (Just an example) How much can my frametime suddenly momentarily jump by without causing any noticeable stuttering or lag? What i mean is if my frametime jumps by about 3ms from its usual (8.5ms) will i feel/notice any stuttering? what about a jump by 10ms? 15ms?  How high can it jump by before i start noticing stuttering? Im sorry if its hard to understand what im asking

[Jurrunio]

everyone feels this in a different way, so there's no concrete answer.

[TLOUFoREVer]

Just now, Jurrunio said:

everyone feels this in a different way, so there's no concrete answer.

Got ya, Is there any increase that could generally be considered something to be worried about?

[Jurrunio]

3 minutes ago, TLOUFoREVer said:

Got ya, Is there any increase that could generally be considered something to be worried about?

in general, frame time 2-3 times your average frame time will lead to noticeable stutters. That's a broad range of numbers.

[FastRDust]

10 minutes ago, TLOUFoREVer said:

Hi, So say my frametime is usally 8.5ms at 60fps (Just an example) How much can my frametime suddenly momentarily jump by without causing any noticeable stuttering or lag? What i mean is if my frametime jumps by about 3ms from its usual (8.5ms) will i feel/notice any stuttering? what about a jump by 10ms? 15ms?  How high can it jump by before i start noticing stuttering? Im sorry if its hard to understand what im asking

So assuming a 120Hz monitor and a 120 FPS output from the GPU, every 8.3333 ms (1/120th of a second) a new frame is generated and sent to the monitor to display. The pixels START changing colors. The response time is the time it takes for the pixels to go from the old frame color to the new frame color. The shorter the better obviously. In a 120Hz monitor if the response time is for example 1ms (for all pixels, see below) it will take 1ms for all pixels to change and then for the remainder of this cycle (7.333 next ms) the frame will be static. We can all see how if the response time is greater than 8.333 ms for a 120Hz screen this would be terrible as the pixels would never quite achieve the final color of the current frame before having to start displaying the next frame again.

Of note response time is not uniform! The reported response time is actually a weighted average. For any given monitor the response time varies for pixels depending on the colors they are going to/from, more specifically the shade of grey of the old/new frame.

Also mentioned in that thread is the fact that most monitors with response times of 1-4ms use something called "overdrive" which will change the pixels color faster but will sometimes overshoot leading to a different kind of image distortion (not blurriness as it is fast, but sometimes does not get the exact color wanted).

Again I take no credit for these concepts, just regurgitationg what I learned from:

http://120hz.net/showthread.php?3357-Please-explain-relationship-of-Refresh-rate-%28Hz%29-and-refresh-speed%28ms%29&p=26900#post26900

Hope this educates some of you guys too it sure helped me figure this out

[TLOUFoREVer]

1 minute ago, Jurrunio said:

in general, frame time 2-3 times your average frame time will lead to noticeable stutters. That's a broad range of numbers.

Thank you very much! A broad range of numbers is better than me having no idea at all