diff --git a/substrate/frame/system/src/lib.rs b/substrate/frame/system/src/lib.rs
index 3b4de0c472..9b30e7b452 100644
--- a/substrate/frame/system/src/lib.rs
+++ b/substrate/frame/system/src/lib.rs
@@ -1272,6 +1272,40 @@ impl<T: Config> Pallet<T> {
 	/// Remove temporary "environment" entries in storage, compute the storage root and return the
 	/// resulting header for this block.
 	pub fn finalize() -> T::Header {
+		log::debug!(
+			target: "runtime::system",
+			"[{:?}] length: {} (normal {}%, op: {}%, mandatory {}%) / normal weight: {} ({}%) \
+			/ op weight {} ({}%) / mandatory weight {} ({}%)",
+			Self::block_number(),
+			Self::all_extrinsics_len(),
+			sp_runtime::Percent::from_rational(
+				Self::all_extrinsics_len(),
+				*T::BlockLength::get().max.get(DispatchClass::Normal)
+			).deconstruct(),
+			sp_runtime::Percent::from_rational(
+				Self::all_extrinsics_len(),
+				*T::BlockLength::get().max.get(DispatchClass::Operational)
+			).deconstruct(),
+			sp_runtime::Percent::from_rational(
+				Self::all_extrinsics_len(),
+				*T::BlockLength::get().max.get(DispatchClass::Mandatory)
+			).deconstruct(),
+			Self::block_weight().get(DispatchClass::Normal),
+			sp_runtime::Percent::from_rational(
+				*Self::block_weight().get(DispatchClass::Normal),
+				T::BlockWeights::get().get(DispatchClass::Normal).max_total.unwrap_or(Bounded::max_value())
+			).deconstruct(),
+			Self::block_weight().get(DispatchClass::Operational),
+			sp_runtime::Percent::from_rational(
+				*Self::block_weight().get(DispatchClass::Operational),
+				T::BlockWeights::get().get(DispatchClass::Operational).max_total.unwrap_or(Bounded::max_value())
+			).deconstruct(),
+			Self::block_weight().get(DispatchClass::Mandatory),
+			sp_runtime::Percent::from_rational(
+				*Self::block_weight().get(DispatchClass::Mandatory),
+				T::BlockWeights::get().get(DispatchClass::Mandatory).max_total.unwrap_or(Bounded::max_value())
+			).deconstruct(),
+		);
 		ExecutionPhase::<T>::kill();
 		AllExtrinsicsLen::<T>::kill();
 
diff --git a/substrate/primitives/arithmetic/src/per_things.rs b/substrate/primitives/arithmetic/src/per_things.rs
index fbd45bb693..c3ccca56ca 100644
--- a/substrate/primitives/arithmetic/src/per_things.rs
+++ b/substrate/primitives/arithmetic/src/per_things.rs
@@ -24,7 +24,6 @@ use crate::traits::{
 };
 use codec::{CompactAs, Encode};
 use num_traits::{Pow, SaturatingAdd, SaturatingSub};
-use sp_debug_derive::RuntimeDebug;
 use sp_std::{
 	convert::{TryFrom, TryInto},
 	fmt, ops,
@@ -425,7 +424,7 @@ macro_rules! implement_per_thing {
 		///
 		#[doc = $title]
 		#[cfg_attr(feature = "std", derive(Serialize, Deserialize))]
-		#[derive(Encode, Copy, Clone, PartialEq, Eq, codec::MaxEncodedLen, PartialOrd, Ord, RuntimeDebug, scale_info::TypeInfo)]
+		#[derive(Encode, Copy, Clone, PartialEq, Eq, codec::MaxEncodedLen, PartialOrd, Ord, sp_std::fmt::Debug, scale_info::TypeInfo)]
 		pub struct $name($type);
 
 		/// Implementation makes any compact encoding of `PerThing::Inner` valid,
@@ -847,7 +846,7 @@ macro_rules! implement_per_thing {
 		#[cfg(test)]
 		mod $test_mod {
 			use codec::{Encode, Decode};
-			use super::{$name, Saturating, RuntimeDebug, PerThing};
+			use super::{$name, Saturating, PerThing};
 			use crate::traits::Zero;
 
 			#[test]
@@ -871,7 +870,7 @@ macro_rules! implement_per_thing {
 				assert!(<$upper_type>::from($max) * <$upper_type>::from($max) < <$upper_type>::max_value());
 			}
 
-			#[derive(Encode, Decode, PartialEq, Eq, RuntimeDebug)]
+			#[derive(Encode, Decode, PartialEq, Eq, Debug)]
 			struct WithCompact<T: codec::HasCompact> {
 				data: T,
 			}