Thanks for the feedback and thanks for even measuring the delay!
The old version should have had this too, at least when tuning one oscillator only, I will check if there is more delay added somehow.
Here is some technical background:
uTune accumulates pitch measurement from the last 100ms and uses this as base for tuning. So the tuning frequency or delay is 100ms in normal circumstances. We do this to get an accurate pitch reading.
If you change the note however we add an additional dead time of 100ms. This is because otherwise the measured pitch is some in-between value and tuning would not work properly.
Generally I recommend a slow Autotuning setting and a well calibrated VCO. Just relying on autotune can get interesting results but will lead to sudden jumps in pitch.