--- a/node/cli/src/command.rs
+++ b/node/cli/src/command.rs
@@ -396,6 +396,8 @@
 			}
 		}
 		#[cfg(feature = "try-runtime")]
+		// embedded try-runtime cli will be removed soon.
+		#[allow(deprecated)]
 		Some(Subcommand::TryRuntime(cmd)) => {
 			use std::{future::Future, pin::Pin};
 
--- a/pallets/inflation/src/lib.rs
+++ b/pallets/inflation/src/lib.rs
@@ -71,7 +71,9 @@
 		type TreasuryAccountId: Get<Self::AccountId>;
 
 		// The block number provider, which should be callable from `on_initialize` hook.
-		type OnInitializeBlockNumberProvider: BlockNumberProvider<BlockNumber = BlockNumberFor<Self>>;
+		type OnInitializeBlockNumberProvider: BlockNumberProvider<
+			BlockNumber = BlockNumberFor<Self>,
+		>;
 
 		/// Number of blocks that pass between treasury balance updates due to inflation
 		#[pallet::constant]
--- a/primitives/common/src/constants.rs
+++ b/primitives/common/src/constants.rs
@@ -23,7 +23,10 @@
 
 use crate::types::{Balance, BlockNumber};
 
+#[cfg(not(feature = "lookahead"))]
 pub const MILLISECS_PER_BLOCK: u64 = 12000;
+#[cfg(feature = "lookahead")]
+pub const MILLISECS_PER_BLOCK: u64 = 3000;
 pub const MILLISECS_PER_RELAY_BLOCK: u64 = 6000;
 
 pub const SLOT_DURATION: u64 = MILLISECS_PER_BLOCK;
--- a/runtime/common/config/pallets/mod.rs
+++ b/runtime/common/config/pallets/mod.rs
@@ -21,7 +21,7 @@
 	traits::{ConstU32, ConstU64, Currency},
 };
 use sp_arithmetic::Perbill;
-use sp_runtime::traits::{BlockNumberProvider, AccountIdConversion};
+use sp_runtime::traits::{AccountIdConversion, BlockNumberProvider};
 use up_common::{
 	constants::*,
 	types::{AccountId, Balance, BlockNumber},
@@ -111,8 +111,8 @@
 	type BlockNumber = BlockNumber;
 
 	fn current_block_number() -> Self::BlockNumber {
+		use hex_literal::hex;
 		use parity_scale_codec::Decode;
-		use hex_literal::hex;
 		use sp_io::storage;
 		// TODO: Replace with the following code after https://github.com/paritytech/polkadot-sdk/commit/3ea497b5a0fdda252f9c5a3c257cfaf8685f02fd lands
 		// <cumulus_pallet_parachain_system::Pallet<Runtime>>::last_relay_block_number()
@@ -122,7 +122,8 @@
 			// First parachain block
 			return Default::default()
 		};
-		BlockNumber::decode(&mut encoded.as_ref()).expect("typeof(RelayBlockNumber) == typeof(BlockNumber) == u32; qed")
+		BlockNumber::decode(&mut encoded.as_ref())
+			.expect("typeof(RelayBlockNumber) == typeof(BlockNumber) == u32; qed")
 	}
 }
 
--- a/runtime/common/config/parachain.rs
+++ b/runtime/common/config/parachain.rs
@@ -38,9 +38,29 @@
 	type ReservedDmpWeight = ReservedDmpWeight;
 	type ReservedXcmpWeight = ReservedXcmpWeight;
 	type XcmpMessageHandler = XcmpQueue;
+	#[cfg(not(feature = "lookahead"))]
 	type CheckAssociatedRelayNumber = cumulus_pallet_parachain_system::RelayNumberStrictlyIncreases;
+	#[cfg(feature = "lookahead")]
+	type CheckAssociatedRelayNumber =
+		cumulus_pallet_parachain_system::RelayNumberMonotonicallyIncreases;
 }
 
 impl parachain_info::Config for Runtime {}
 
 impl cumulus_pallet_aura_ext::Config for Runtime {}
+
+/// Maximum number of blocks simultaneously accepted by the Runtime, not yet included
+/// into the relay chain.
+#[cfg(feature = "lookahead")]
+const UNINCLUDED_SEGMENT_CAPACITY: u32 = 3;
+/// How many parachain blocks are processed by the relay chain per parent. Limits the
+/// number of blocks authored per slot.
+#[cfg(feature = "lookahead")]
+const BLOCK_PROCESSING_VELOCITY: u32 = 2;
+#[cfg(feature = "lookahead")]
+pub type ConsensusHook = cumulus_pallet_aura_ext::FixedVelocityConsensusHook<
+	Runtime,
+	{ MILLISECS_PER_RELAY_BLOCK as u32 },
+	BLOCK_PROCESSING_VELOCITY,
+	UNINCLUDED_SEGMENT_CAPACITY,
+>;
--- a/runtime/common/runtime_apis.rs
+++ b/runtime/common/runtime_apis.rs
@@ -682,11 +682,10 @@
 			#[cfg(feature = "lookahead")]
 			impl cumulus_primitives_aura::AuraUnincludedSegmentApi<Block> for Runtime {
 				fn can_build_upon(
-					_included_hash: <Block as BlockT>::Hash,
-					_slot: cumulus_primitives_aura::Slot,
+					included_hash: <Block as BlockT>::Hash,
+					slot: cumulus_primitives_aura::Slot,
 				) -> bool {
-					// FIXME: Limit velocity
-					true
+					$crate::config::parachain::ConsensusHook::can_build_upon(included_hash, slot)
 				}
 			}