Right now I have the MIIO Binding installed again and experience no delay.
However when I install the Network Binding the delays start again. Right after installing the binding the delays are around 3-4 seconds but then they increase after a few minutes to 1-2 minutes.
Could you please also test if removing the network binding solves the issue?
For me it seems something is waiting for something to finish before sending the hue command…
Maybe the authors of the network binding could have a look?