Over the past few months, I've been moving my smart home over to Homekit from Google. I have a lot of devices, including 2 Apple TVs, 7 Homepods, and about 50 other devices on my network. I've been using my trusty TP Link Archer 5400X Tri-band router, and I've been battling to get rid of that dreaded "No Response" in the Home app. I've tried quite a few things, but it was always hit or miss. I'd tell Siri to turn something off, and it would respond that the device wasn't responding, but it would work.

My wife was getting tired of it being unreliable, so I was close to pulling the trigger on a new router. I decided to try one more thing before dropping some coin on a new one:

Enabling IGMP Snooping.

Now, your mileage may vary, but this one setting has been THE setting that woke everything up for me. After enabling this setting, and restarting everything, I haven't seen a "No Response" since. Everything is running faster, automations happen instantly, like they are supposed to. It seems that all my devices were basically flooding my network with needless traffic, causing those timeouts.

Again, your experience might differ. I've seen a lot of people saying that disabling it on Unifi switches helped them, but on my TP Link, ENABLING it has worked wonders.