I think Apple has created a circular network problem in the iOS17 release - I'm having similar bad latency issues across all my HomePods, ATV's and the Home App in general - my home app takes 60-90 seconds to get the states of the devices in my network - it used to take 2-4 seconds after opening the app - and once it gets out of the Updating... state it's wrong about 50% of the time on the state of the device (the light is not on, but Home says it's on)
I've had particular trouble with Matter.io devices on the network that were using Thread. They don't update or respond any longer at all, so I've been unplugging them (Eve Energy) at this point - they had been somewhat stable in the iOS16 world - I've also lost control of my Yale Apple door locks...
The reason I think it's a circular network problem is because states of devices keep changing at random - a given device like the Apple TV can now talk over wifi, thread, wired-ethernet, and even bluetooth - and I think messages may be flowing across multiple paths and stomping on each other
I have a lot of Apple TVs and HomePods and in the Home App home settings hubs tab, I see that one of the ATVs is Connected, the rest are in Standby and the Mini's say Not Responding...
I have a lot more work to do - I have to force the ATV's to update to 17.0 (they are in Auto update mode, but none have self-initiated that yet...) and I'm resetting the Mini's, but overall, I'm not optimistic about getting my Home app back in a healthy place - this is the least stable release I've experience in my 5 years of using HomeKit...