Siri AI Home requests can take up to twice as long in the iOS 27.3 beta and macOS 27.3 beta when you speak English. Quick testing puts the added delay at more than one second, and the rules that should fix it are already in the beta but switched off.
The slowdown comes from a routing change. Apple removed the old rules that sent Home commands to old Siri (Siri X), while the new rules that take their place are still disabled by a feature flag. pdfu found the change in the beta and posted it on X.
Siri AI Home requests now take a server detour
In iOS 27.2 and earlier, Skimmer, the regex rule matcher at the front of Siri AI, recognized common Home phrases such as “Turn on the <accessory>” and passed them straight to Siri X. Only the requests Skimmer could not match went to Private Cloud Compute, Apple’s server-based models.
The iOS 27.3 beta deletes those Siri X rules before the replacements are on. Every English Home request therefore reaches Private Cloud Compute first, and the server model then hands the task back to Siri X, which still carries out Home tasks.
On iOS and macOS 27.3, Siri AI can take up to 2× longer to handle Home requests in English. Here’s why.
In OS 27.2 or earlier, Siri AI used Skimmer, its regex rule matcher, to parse common Home requests like “Turn on the <accessory>” and route them to old Siri (Siri X). All unmatched requests were processed by PCC. The server model still hands off to Siri X for Home tasks.
In 27.3, Apple is adding Skimmer rules for Home tasks backed by App Intents. But 27.3 removes the old Siri X rules while the new rules are still disabled by a feature flag.
The result is that every Home request currently ends up on PCC before reaching Siri X. In some quick testing, this change can add over 1s of latency.
The problem should be rectified once Apple enables the new Skimmer Home rules in a future beta. The change only affects requests in English.
— pdfu (@itspdfu) November 13, 2026
Skimmer is the fast path
The detour costs time because Skimmer picks a tool without running a language model. In earlier testing, pdfu measured Skimmer calling the music play tool in under 120ms, up to 6 times faster than the on-device or Private Cloud Compute model.
A Home command now loses that shortcut and makes a round trip to Apple’s servers, which is where the extra second in pdfu’s quick testing comes from. He says Home requests can take up to 2 times longer than before.
New Home rules wait behind a flag
The rules Apple is adding in 27.3 cover Home tasks backed by App Intents, the framework apps use to give Siri AI actions it can run. Once Apple enables the feature flag, Skimmer should catch common Home phrases again without a server trip.
pdfu expects the fix to arrive in a future beta. The change only affects requests in English, so Home requests in other languages are not affected, and iOS 27.2 and macOS 27.2 keep the old Skimmer rules.
Apple has not announced the routing change or said when the new rules will turn on.
