Frame drop independend script?

I tried to run a script with setInterval within an exact time interval but if the interval is smaller than the frame time (even if fps are set highter) when framedrops occur the script does not seem to be executed early enough.
Is there a more decent way to have a script executed exactly every X number of milliseconds?
TIA

I made a check to see if there is any difference when using a EnterFrame Event, setInterval and a Timer object in a MovieClip that has framedrops. But it seems that there is no way to execute a script earlier than a frame script.
Edit: My problem is that I want to interpolate an input value from a tcpip soucre. And when I got frame drops the movement on screen is stuttering.
I heard the is the possibility of using a thread in flash ...

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