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From: rbowman <bowman@montana.com>
Newsgroups: comp.os.linux.advocacy
Subject: Re: Yet Even Fresher Linux
Date: 2 Aug 2025 06:01:10 GMT
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On Sat, 2 Aug 2025 05:30:49 -0000 (UTC), Gremlin wrote:

> Farley Flud <ff@linux.rocks>
> news:pan$ab58a$bf644371$fa8ab850$ad148e2f@linux.rocks Thu, 31 Jul 2025
> 18:58:19 GMT in alt.computer.workshop, wrote:
> 
>> On Thu, 31 Jul 2025 04:46:50 -0000 (UTC), Gremlin wrote:
>> 
>>> looking for noticeable differences in performance or behaviour of the
>>> machine.
>>> 
>>> 
>> What do you mean by "noticeable?"
>> 
>> Human sensory perception cannot detect differences in performance.
>> Such things must be rigorously measured.
> 
> Actually, depending on the hardware; human sensory is fast enough to
> catch a performance difference.
> In this specific request though, I was asking if they happened to notice
> any difference in the systems performance; I assume they also understood
> my question was asking how the system 'felt' between the differences.
> Does that make better sense?

The rule of thumb is 500 milliseconds. For example if you click on a 
button and it takes 500 msec for something to happen most users will feel 
the system is sluggish. 

For many things that might be considered more than sluggish.  For context:
(trigger warning: triggers get pulled)

https://www.youtube.com/watch?v=WzHG-ibZaKM

The bangs are about 125 msecs apart and there is no problem discerning the 
individual events. I don't know if it has been applied to computer systems 
but the concept of JNDs has been around for a long time.

https://en.wikipedia.org/wiki/Just-noticeable_difference