diff --git a/math/CHANGELOG.md b/math/CHANGELOG.md
index 0d76574cfe..5161b86e19 100644
--- a/math/CHANGELOG.md
+++ b/math/CHANGELOG.md
@@ -45,6 +45,7 @@ Ref: https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.j
 * [#19386](https://github.com/cosmos/cosmos-sdk/pull/19386) Speedup `math.Int` overflow checks
 * [#19466](https://github.com/cosmos/cosmos-sdk/pull/19466) Speedup `math.NewLegacyDec` by one heap allocation
 * [#19467](https://github.com/cosmos/cosmos-sdk/pull/19467) Slightly speedup `math.LegacyDec` `Ceil` and `MarshalTo` methods
+* [#19479](https://github.com/cosmos/cosmos-sdk/pull/19479) Speedup `math.LegacyDec` functions that involve `math.Int` by removing a heap allocation. (`Ceil`, `TruncateInt`, `NewLegacyDecFromInt`)
 
 ### Bug Fixes
 
diff --git a/math/dec.go b/math/dec.go
index bd43232bf3..30d5ef464f 100644
--- a/math/dec.go
+++ b/math/dec.go
@@ -132,7 +132,7 @@ func LegacyNewDecFromInt(i Int) LegacyDec {
 // CONTRACT: prec <= Precision
 func LegacyNewDecFromIntWithPrec(i Int, prec int64) LegacyDec {
 	return LegacyDec{
-		new(big.Int).Mul(i.BigInt(), precisionMultiplier(prec)),
+		new(big.Int).Mul(i.BigIntMut(), precisionMultiplier(prec)),
 	}
 }
 
@@ -351,7 +351,7 @@ func (d LegacyDec) MulInt(i Int) LegacyDec {
 }
 
 func (d LegacyDec) MulIntMut(i Int) LegacyDec {
-	d.i.Mul(d.i, i.BigInt())
+	d.i.Mul(d.i, i.BigIntMut())
 	if d.i.BitLen() > maxDecBitLen {
 		panic("Int overflow")
 	}
@@ -434,7 +434,7 @@ func (d LegacyDec) QuoInt(i Int) LegacyDec {
 }
 
 func (d LegacyDec) QuoIntMut(i Int) LegacyDec {
-	d.i.Quo(d.i, i.BigInt())
+	d.i.Quo(d.i, i.BigIntMut())
 	return d
 }
 
@@ -692,7 +692,7 @@ func (d LegacyDec) RoundInt64() int64 {
 
 // RoundInt round the decimal using bankers rounding
 func (d LegacyDec) RoundInt() Int {
-	return NewIntFromBigInt(chopPrecisionAndRoundNonMutative(d.i))
+	return NewIntFromBigIntMut(chopPrecisionAndRoundNonMutative(d.i))
 }
 
 // chopPrecisionAndTruncate is similar to chopPrecisionAndRound,
@@ -718,7 +718,7 @@ func (d LegacyDec) TruncateInt64() int64 {
 
 // TruncateInt truncates the decimals from the number and returns an Int
 func (d LegacyDec) TruncateInt() Int {
-	return NewIntFromBigInt(chopPrecisionAndTruncateNonMutative(d.i))
+	return NewIntFromBigIntMut(chopPrecisionAndTruncateNonMutative(d.i))
 }
 
 // TruncateDec truncates the decimals from the number and returns a Dec