I converted an audio file to keyframes and would like the video to speed up accordingly to the resulting slider. Hence I’m trying to get the Speed-Parameter of the Timewarp-Effect hooked up with a slider via an expression (having the Speed equal 100 + the Slider-Value) - However, this results in extremely long render-time.
I figured it could be down to the slider containing a complicated value, so I had it rounded to full numbers, but this doesn’t change a thing. I deactivated all frame-generating parameters too, and the effect does render super-fast when I manually enter a value, no matter how precise (e.g. 112,43 or 56,79 or whatever). But once it gets connected to the slider, it slows down immensely (like 0,1 fps render-speed)
What could cause the extreme render time using the expression, and is there a way to avoid it or achieve the desired effect some other way?