diff --git a/runtime/src/lib.rs b/runtime/src/lib.rs
index dec65f60f..45ebee849 100644
--- a/runtime/src/lib.rs
+++ b/runtime/src/lib.rs
@@ -848,6 +848,18 @@ impl pallet_commitments::Config for Runtime {
     type RateLimit = CommitmentRateLimit;
 }
 
+#[cfg(not(feature = "fast-blocks"))]
+pub const INITIAL_SUBNET_TEMPO: u16 = 99;
+
+#[cfg(feature = "fast-blocks")]
+pub const INITIAL_SUBNET_TEMPO: u16 = 10;
+
+#[cfg(not(feature = "fast-blocks"))]
+pub const INITIAL_CHILDKEY_TAKE_RATELIMIT: u64 = 216000; // 30 days at 12 seconds per block
+
+#[cfg(feature = "fast-blocks")]
+pub const INITIAL_CHILDKEY_TAKE_RATELIMIT: u64 = 5;
+
 // Configure the pallet subtensor.
 parameter_types! {
     pub const SubtensorInitialRho: u16 = 10;
@@ -860,7 +872,7 @@ parameter_types! {
     pub const SubtensorInitialValidatorPruneLen: u64 = 1;
     pub const SubtensorInitialScalingLawPower: u16 = 50; // 0.5
     pub const SubtensorInitialMaxAllowedValidators: u16 = 128;
-    pub const SubtensorInitialTempo: u16 = 99;
+    pub const SubtensorInitialTempo: u16 = INITIAL_SUBNET_TEMPO;
     pub const SubtensorInitialDifficulty: u64 = 10_000_000;
     pub const SubtensorInitialAdjustmentInterval: u16 = 100;
     pub const SubtensorInitialAdjustmentAlpha: u64 = 0; // no weight to previous value.
@@ -883,7 +895,7 @@ parameter_types! {
     pub const SubtensorInitialMaxBurn: u64 = 100_000_000_000; // 100 tao
     pub const SubtensorInitialTxRateLimit: u64 = 1000;
     pub const SubtensorInitialTxDelegateTakeRateLimit: u64 = 216000; // 30 days at 12 seconds per block
-    pub const SubtensorInitialTxChildKeyTakeRateLimit: u64 = 216000; // 30 days at 12 seconds per block
+    pub const SubtensorInitialTxChildKeyTakeRateLimit: u64 = INITIAL_CHILDKEY_TAKE_RATELIMIT;
     pub const SubtensorInitialRAORecycledForRegistration: u64 = 0; // 0 rao
     pub const SubtensorInitialSenateRequiredStakePercentage: u64 = 1; // 1 percent of total stake
     pub const SubtensorInitialNetworkImmunity: u64 = 7 * 7200;