I noticed since 2.12.6 that my network has had a fair amount of lag. For example, I have a couple of closet lights that are connected with smart plugs that would toggle before I think my mouse button sprang up from clicking “on”. Now, sometimes I can wait 15-20 seconds for it to click on - sometimes longer!
Everything just seems laggy now and the only tech thing in the house that changed is updating to 2.12.6 and the latest firmware for my Conbee II.