Is Colibri iterator causing exponentially increasing computation times?

I am using Colibri (from TT Toolbox 1.9) to iterate over some parameters and export it, as it is delivers convinient functionality for it. Unfortunately, using it on a too big parameter space causes Rhino to crash due to running out of memory. Trying to investigate this i figured out, that on my machine it slows down considerably, even when there are basically no calculations done.

Has anyone any idea what is going on?

(I attached a diagram of the increasing times, taken from a small definition that is just recording the momentary time by a script. The slider does nothing, it just expires the script-component.)
colibri slow down (8.4 KB)