millisec test timings and screen refresh rate

[Richard Gaskin]

Phil Davis wrote:

> Thanks everyone. But... Let me put my question another way:
> 
> on mouseUp
>    # lock screen -- aka "lock #1"
>    wait 1 second
>    show img 1
>    # unlock screen -- also part of lock #1
> 
>    put the milliseconds into tStart
>    wait 5 milliseconds
> 
>    # lock screen -- aka "lock #2"
>    hide img 1
>    #unlock screen -- also part of lock #2
> 
>    put the milliseconds - tStart & cr after fld 1
>    set the vScroll of fld 1 to the formattedHeight of fld 1
>    put (the number of lines in fld 1) into fld 2
> end mouseUp
> 
> 
> I ran the above script x times and got these results on my Apple 20" 
> cinema display & intel mini:
> 
> - 50x with no locks/unlocks = 24% of times I saw the img
> - 50x with lock #1 = 20% of times I saw the img
> - 50x with lock #1 & #2 = 36% of times I saw the img
> 
> Ideally I would see the image 100% of the time - that's my goal. I'll 
> experiment with the other methods of displaying the image and see if I 
> can improve my results.

I wonder if it would make a difference to change the wait command to 
"wait...with messages".  I believe the "with messages" option frees up 
cycles to the OS, which helps it refresh.

-- 
  Richard Gaskin
  Fourth World Media Corporation
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