diff --git a/esphome/components/bluetooth_connection/bluetooth_connection_rp2.cpp b/esphome/components/bluetooth_connection/bluetooth_connection_rp2.cpp
index 5966ce343f..2f3d203556 100644
--- a/esphome/components/bluetooth_connection/bluetooth_connection_rp2.cpp
+++ b/esphome/components/bluetooth_connection/bluetooth_connection_rp2.cpp
@@ -524,6 +524,14 @@ void RP2GattClient::handle_event_(const RP2GattEvent &event) {
         this->state_ = EngineState::READY;
         // Scanning resumes and runs alongside the established connection.
         this->release_scan_inhibit_();
+        if (this->connection_type_ == ble_device_base::ConnectionType::V3_WITH_CACHE) {
+          // Cached connections never run discovery, so nothing consumes the
+          // FAST interval; settle to MEDIUM now (esp32 parity). Sustained
+          // FAST intervals starve WiFi on the shared CYW43 radio.
+          BluetoothLock lock;
+          gap_update_connection_parameters(this->con_handle_, MEDIUM_MIN_CONN_INTERVAL, MEDIUM_MAX_CONN_INTERVAL, 0,
+                                           MEDIUM_CONN_TIMEOUT);
+        }
         this->listener_->on_connection_state(true, this->mtu_, 0);
       }
       break;
diff --git a/esphome/components/bluetooth_connection/bluetooth_connection_rp2.h b/esphome/components/bluetooth_connection/bluetooth_connection_rp2.h
index 6624e1af3e..248e268130 100644
--- a/esphome/components/bluetooth_connection/bluetooth_connection_rp2.h
+++ b/esphome/components/bluetooth_connection/bluetooth_connection_rp2.h
@@ -95,8 +95,9 @@ class RP2GattClient final : public Component, public Parented<rp2040_ble::RP2040
   int pair();
   int update_connection_params(uint16_t min_interval, uint16_t max_interval, uint16_t latency, uint16_t timeout);
   ble_device_base::GattServiceTable get_service_table();
-  // No connection-type branching on this backend.
-  void set_connection_type(ble_device_base::ConnectionType ct) {}
+  // Cached connections settle straight to MEDIUM parameters on link-up
+  // (esp32 parity); FAST is reserved for connect and discovery.
+  void set_connection_type(ble_device_base::ConnectionType ct) { this->connection_type_ = ct; }
   void release_services();
 
  protected:
@@ -199,6 +200,7 @@ class RP2GattClient final : public Component, public Parented<rp2040_ble::RP2040
   uint8_t notify_subscription_count_{0};
   uint8_t engine_index_{0};  // position in instances[]; tags log lines per slot
   bd_addr_t peer_addr_{};    // MSB-first, as gap_connect expects
+  ble_device_base::ConnectionType connection_type_{ble_device_base::ConnectionType::V3_WITHOUT_CACHE};
   EngineState state_{EngineState::IDLE};
   DiscoveryPhase discovery_phase_{DiscoveryPhase::NONE};
   OpType op_type_{OpType::NONE};