diff --git a/packages/util/src/u8a/toBigInt.spec.ts b/packages/util/src/u8a/toBigInt.spec.ts
index 6076be5fe9..63bde321a3 100644
--- a/packages/util/src/u8a/toBigInt.spec.ts
+++ b/packages/util/src/u8a/toBigInt.spec.ts
@@ -375,12 +375,8 @@ describe('u8aToBigInt', (): void => {
     ).toBe(256n);
   });
 
-  perf('u8aToBigInt (i32)', 750_000, [[new Uint8Array([0x68, 0x65, 0x6c, 0x6c])]], (v: Uint8Array) => u8aToBigInt(v, { isNegative: true }));
-
+  perf('u8aToBigInt (i32)', 750_000, [[new Uint8Array([0x9c, 0x9c, 0x9c, 0x9c])]], (v: Uint8Array) => u8aToBigInt(v, { isNegative: true }));
   perf('u8aToBigInt (u32)', 750_000, [[new Uint8Array([0x68, 0x65, 0x6c, 0x6c])]], u8aToBigInt);
   perf('u8aToBigInt (u64)', 750_000, [[new Uint8Array([0x68, 0x65, 0x6c, 0x6c, 0x68, 0x65, 0x6c, 0x6c])]], u8aToBigInt);
   perf('u8aToBigInt (u128)', 750_000, [[new Uint8Array([0x68, 0x65, 0x6c, 0x6c, 0x68, 0x65, 0x6c, 0x6c, 0x68, 0x65, 0x6c, 0x6c, 0x68, 0x65, 0x6c, 0x6c])]], u8aToBigInt);
-
-  // perf('BigInt (constructor)', 1_000_000, [[12345678]], (v: number) => BigInt(v).toString());
-  // perf('BigInt (constructor -> string)', 1_000_000, [[12345678]], (v: number) => BigInt(v).toString());
 });
diff --git a/packages/util/src/u8a/toBn.spec.ts b/packages/util/src/u8a/toBn.spec.ts
index 4030ed644b..1d2247504c 100644
--- a/packages/util/src/u8a/toBn.spec.ts
+++ b/packages/util/src/u8a/toBn.spec.ts
@@ -376,12 +376,8 @@ describe('u8aToBn', (): void => {
     ).toBe(256);
   });
 
-  perf('u8aToBn (i32)', 750_000, [[new Uint8Array([0x68, 0x65, 0x6c, 0x6c])]], (v: Uint8Array) => u8aToBn(v, { isNegative: true }));
-
+  perf('u8aToBn (i32)', 750_000, [[new Uint8Array([0x9c, 0x9c, 0x9c, 0x9c])]], (v: Uint8Array) => u8aToBn(v, { isNegative: true }));
   perf('u8aToBn (u32)', 750_000, [[new Uint8Array([0x68, 0x65, 0x6c, 0x6c])]], u8aToBn);
   perf('u8aToBn (u64)', 750_000, [[new Uint8Array([0x68, 0x65, 0x6c, 0x6c, 0x68, 0x65, 0x6c, 0x6c])]], u8aToBn);
   perf('u8aToBn (u128)', 750_000, [[new Uint8Array([0x68, 0x65, 0x6c, 0x6c, 0x68, 0x65, 0x6c, 0x6c, 0x68, 0x65, 0x6c, 0x6c, 0x68, 0x65, 0x6c, 0x6c])]], u8aToBn);
-
-  // perf('BN (constructor)', 1_000_000, [[12345678]], (v: number) => new BN(v));
-  // perf('BN (constructor -> string)', 1_000_000, [[12345678]], (v: number) => new BN(v).toString());
 });
diff --git a/packages/util/src/u8a/toNumber.spec.ts b/packages/util/src/u8a/toNumber.spec.ts
index f7e9a45c2d..3220494477 100644
--- a/packages/util/src/u8a/toNumber.spec.ts
+++ b/packages/util/src/u8a/toNumber.spec.ts
@@ -190,6 +190,6 @@ describe('u8aToNumber', (): void => {
     });
   });
 
-  perf('u8aToNumber (i32)', 750_000, [[new Uint8Array([0x68, 0x65, 0x6c, 0x6c])]], (v: Uint8Array) => u8aToNumber(v, { isNegative: true }));
+  perf('u8aToNumber (i32)', 750_000, [[new Uint8Array([0x9c, 0x9c, 0x9c, 0x9c])]], (v: Uint8Array) => u8aToNumber(v, { isNegative: true }));
   perf('u8aToNumber (u32)', 750_000, [[new Uint8Array([0x68, 0x65, 0x6c, 0x6c])]], u8aToNumber);
 });