Hello, thanks for the feedback!
(I've answered your email too)
Unfortunately, it would have an impact, it would not be buggy, but the frame rate would decrease. The IKSolver2D alone is responsible for around 30% of the process and it keeps that percentage while increasing the cycle time proportionally to the amount of units in scene.
Your question was very pertinent, there is indeed room for improvement and I'll make sure to do a more detailed analysis on this case and look for ways to increase performance when updating the asset.