After effects wiggle expression variable

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When now I duplicate this text line several times and start to tweak it's position then the crash happens. Beginning from z=0 up to -500 (directly in front of the camera) the values are transformed by easyOut() to 0-10.

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I just have a text layer where I control the letter-spacing depandend from the current z-position. I have massive crashes when using this expression script below.

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