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Comments on: Tbeachball



noise from signal



Last Build Date: Thu, 10 Nov 2011 07:05:56 +0000

 



By: monk.e.boy

Tue, 28 Aug 2007 09:56:38 +0000

Would having a multithreaded GUI improve user perceived performance? I find sites that use Java impossible to use, the whole GUI locks up, I can't even switch tabs while I'm waiting for the page to load.

I think that would be a huge gain, what do they call it? Low hanging fruit?

Also, my project: http://teethgrinder.co.uk/open-flash-chart/ shows nice graphs in web pages :-) Yeah, I know it is the evil flash. But if IE ever gets SVG I'll port it over.

cheers,

monk.e.boy




By: Alex Faaborg

Tue, 28 Aug 2007 08:19:57 +0000

This is really great data to have!

>we got a little above the 200 ms rule-of-thumb perception threshold >for interactivity

This threshold is actually often called Tp (time for perception), but I like Tbeachball a lot more. 200 ms is actually the high end, the range is 50-200 ms.

"The reason for the range is not only variance in individual humans; it is also varies with conditions. For example, the perceptual processor is faster (shorter cycle time)for more intense stimuli, and slower for weak stimuli." Page 9, http://ocw.mit.edu/NR/rdonlyres/Electrical-Engineering-and-Computer-Science/6-831Fall-2004/0A79F491-80BA-4E19-885C-1E7E481FA2A3/0/L4.pdf

So when looking at this data, we should consider the range. 200 ms is probably good for a 16x16 icon appearing in the location bar, but we might want to shoot for 50 ms for more drastic changes, like a dialog box appearing.




By: Boris

Sun, 26 Aug 2007 04:58:10 +0000

It'd be really nice to get data for this while running Tp!




By: Fredrik

Sat, 25 Aug 2007 17:51:13 +0000

Patch link doesn't work as I'm typing this (404).

Could a test like this be automated fully in software?

One can, of course, build a little USB-controlled hardware box based on a micro controller board that hooks up to the PS/2 ports and sends a series of mouse/keyboard events and measure "Tbeachball" based on that. To predictably repeat the actual hardware input events human interaction would yield. (Not sure if there is testing equipment that does this already.)