> I do a simple test and I found that I can see the 
> theretentivity of vision  when delay is > 0.02, a little 
> small than 1/25. So 0.01 is enough for most of people I guess.

What refresh rate is your monitor?

Most lcd panels seem to be 60Hz or similar. 
So 0.01 (100Hz) is probably still wasteful, as you might render 100
frames of which only 60 will ever be displayed, 40 may be lost entirely
- that's pretty wasteful...

In which case, 0.017 might be worth a shot?
Though, that's about 59Hz, so depending on how your graphics card
handles things, that might actually beat really horribly with the 60Hz
monitor refresh, so...

And note that 0.02 is not 1/25 (or 25Hz), it's 50Hz - twice as fast.

To be honest, I'd be surprised if most people noticed the flicker at
0.04 (which is 25Hz) in practice on a typical monitor, especially the
current crop of lcd monitors...



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