Hello everyone,
I am French and I have exactly the same problem as you, there is latency between my Oled 804 TV and the Philips Hue.
I contacted Philips France who replied:
"I am really sorry for you but here is the official answer:
Hue lamps do not change in real time compared to changes in the TV's Ambilight and there is a delay of about 1 to 2 seconds.
This is normal behavior. Ambilight changes must be communicated to an external system (i.e. Hue Bridge + associated lights) and be actioned. The delay depends on the constellation of devices, network configuration, etc. For our part, we are also working on software improvements to further reduce the delay."
I sent them two videos or at the end of 2019 there was zero second of latency between the TV and the bulbs so that it was since their update in early 2020 that was the cause of this latency, since no response.
Sorry if my english is not perfect ^^.