diff --git a/cumulus/parachains/runtimes/bridge-hubs/bridge-hub-rococo/Cargo.toml b/cumulus/parachains/runtimes/bridge-hubs/bridge-hub-rococo/Cargo.toml
index 5b6ebc5d6a67..f664017b0e5e 100644
--- a/cumulus/parachains/runtimes/bridge-hubs/bridge-hub-rococo/Cargo.toml
+++ b/cumulus/parachains/runtimes/bridge-hubs/bridge-hub-rococo/Cargo.toml
@@ -223,7 +223,6 @@ std = [
 ]
 
 runtime-benchmarks = [
-	"beacon-spec-mainnet",
 	"bridge-hub-common/runtime-benchmarks",
 	"bridge-runtime-common/runtime-benchmarks",
 	"cumulus-pallet-parachain-system/runtime-benchmarks",
@@ -299,8 +298,8 @@ try-runtime = [
 ]
 
 experimental = ["pallet-aura/experimental"]
-beacon-spec-mainnet = [
-	"snowbridge-ethereum-beacon-client/beacon-spec-mainnet",
+fast-runtime = [
+	"snowbridge-ethereum-beacon-client/beacon-spec-minimal",
 ]
 
 # A feature that should be enabled when the runtime should be built for on-chain
diff --git a/cumulus/parachains/runtimes/bridge-hubs/bridge-hub-rococo/src/lib.rs b/cumulus/parachains/runtimes/bridge-hubs/bridge-hub-rococo/src/lib.rs
index 4f1c4c6e23f4..c461998888bd 100644
--- a/cumulus/parachains/runtimes/bridge-hubs/bridge-hub-rococo/src/lib.rs
+++ b/cumulus/parachains/runtimes/bridge-hubs/bridge-hub-rococo/src/lib.rs
@@ -99,6 +99,8 @@ use parachains_common::{
 	HOURS, MAXIMUM_BLOCK_WEIGHT, NORMAL_DISPATCH_RATIO, SLOT_DURATION,
 };
 
+use polkadot_runtime_common::prod_or_fast;
+
 #[cfg(feature = "runtime-benchmarks")]
 use crate::xcm_config::benchmark_helpers::DoNothingRouter;
 #[cfg(feature = "runtime-benchmarks")]
@@ -566,7 +568,7 @@ impl snowbridge_outbound_queue::Config for Runtime {
 	type Channels = EthereumSystem;
 }
 
-#[cfg(not(feature = "beacon-spec-mainnet"))]
+#[cfg(feature = "fast-runtime")]
 parameter_types! {
 	pub const ChainForkVersions: ForkVersions = ForkVersions {
 		genesis: Fork {
@@ -586,30 +588,32 @@ parameter_types! {
 			epoch: 0,
 		},
 	};
-	pub const MaxExecutionHeadersToKeep:u32 = 1000;
 }
 
-#[cfg(feature = "beacon-spec-mainnet")]
+#[cfg(not(feature = "fast-runtime"))]
 parameter_types! {
 	pub const ChainForkVersions: ForkVersions = ForkVersions {
 		genesis: Fork {
-			version: [0, 0, 16, 32], // 0x00001020
+			version: [144, 0, 0, 111], // 0x90000069
 			epoch: 0,
 		},
 		altair: Fork {
-			version: [1, 0, 16, 32], // 0x01001020
-			epoch: 36660,
+			version: [144, 0, 0, 112], // 0x90000070
+			epoch: 50,
 		},
 		bellatrix: Fork {
-			version: [2, 0, 16, 32], // 0x02001020
-			epoch: 112260,
+			version: [144, 0, 0, 113], // 0x90000071
+			epoch: 100,
 		},
 		capella: Fork {
-			version: [3, 0, 16, 32], // 0x03001020
-			epoch: 162304,
+			version: [144, 0, 0, 114], // 0x90000072
+			epoch: 56832,
 		},
 	};
-	pub const MaxExecutionHeadersToKeep:u32 = 8192 * 2;
+}
+
+parameter_types! {
+	pub const MaxExecutionHeadersToKeep: u32 = prod_or_fast!(8192 * 2, 1000);
 }
 
 impl snowbridge_ethereum_beacon_client::Config for Runtime {
diff --git a/cumulus/polkadot-parachain/Cargo.toml b/cumulus/polkadot-parachain/Cargo.toml
index dd17ccebaf15..19e6f733201f 100644
--- a/cumulus/polkadot-parachain/Cargo.toml
+++ b/cumulus/polkadot-parachain/Cargo.toml
@@ -118,13 +118,10 @@ tokio = { version = "1.32.0", features = ["macros", "parking_lot", "time"] }
 wait-timeout = "0.2"
 
 [features]
-default = [
-	"beacon-spec-mainnet",
-]
+default = []
 runtime-benchmarks = [
 	"asset-hub-rococo-runtime/runtime-benchmarks",
 	"asset-hub-westend-runtime/runtime-benchmarks",
-	"beacon-spec-mainnet",
 	"bridge-hub-rococo-runtime/runtime-benchmarks",
 	"bridge-hub-westend-runtime/runtime-benchmarks",
 	"collectives-westend-runtime/runtime-benchmarks",
@@ -164,6 +161,6 @@ try-runtime = [
 	"shell-runtime/try-runtime",
 	"sp-runtime/try-runtime",
 ]
-beacon-spec-mainnet = [
-	"bridge-hub-rococo-runtime/beacon-spec-mainnet",
+fast-runtime = [
+	"bridge-hub-rococo-runtime/fast-runtime",
 ]