diff --git a/packages/types/src/codec/AbstractArray.ts b/packages/types/src/codec/AbstractArray.ts
index 19e8ea8145..42a0d1cb15 100644
--- a/packages/types/src/codec/AbstractArray.ts
+++ b/packages/types/src/codec/AbstractArray.ts
@@ -98,18 +98,26 @@ export abstract class AbstractArray<T extends Codec> extends Array<T> implements
    * @description Converts the Object to to a human-friendly JSON, with additional fields, expansion and formatting of information
    */
   public toHuman (isExtended?: boolean): AnyJson {
-    return this.map((entry): AnyJson =>
-      entry.toHuman(isExtended)
-    );
+    const result = new Array<AnyJson>(this.length);
+
+    for (let i = 0; i < this.length; i++) {
+      result[i] = this[i].toHuman(isExtended);
+    }
+
+    return result;
   }
 
   /**
    * @description Converts the Object to JSON, typically used for RPC transfers
    */
   public toJSON (): AnyJson {
-    return this.map((entry): AnyJson =>
-      entry.toJSON()
-    );
+    const result = new Array<AnyJson>(this.length);
+
+    for (let i = 0; i < this.length; i++) {
+      result[i] = this[i].toJSON();
+    }
+
+    return result;
   }
 
   /**
@@ -121,12 +129,13 @@ export abstract class AbstractArray<T extends Codec> extends Array<T> implements
    * @description Returns the string representation of the value
    */
   public override toString (): string {
-    // Overwrite the default toString representation of Array.
-    const data = this.map((entry): string =>
-      entry.toString()
-    );
+    const result = new Array<string>(this.length);
 
-    return `[${data.join(', ')}]`;
+    for (let i = 0; i < this.length; i++) {
+      result[i] = this[i].toString();
+    }
+
+    return `[${result.join(', ')}]`;
   }
 
   /**
@@ -134,9 +143,11 @@ export abstract class AbstractArray<T extends Codec> extends Array<T> implements
    * @param isBare true when the value has none of the type-specific prefixes (internal)
    */
   public toU8a (isBare?: boolean): Uint8Array {
-    const encoded = this.map((entry): Uint8Array =>
-      entry.toU8a(isBare)
-    );
+    const encoded = new Array<Uint8Array>(this.length);
+
+    for (let i = 0; i < this.length; i++) {
+      encoded[i] = this[i].toU8a(isBare);
+    }
 
     return isBare
       ? u8aConcat(...encoded)
diff --git a/packages/types/src/codec/Struct.ts b/packages/types/src/codec/Struct.ts
index 2e997669c3..7941af1043 100644
--- a/packages/types/src/codec/Struct.ts
+++ b/packages/types/src/codec/Struct.ts
@@ -303,18 +303,22 @@ export class Struct<
   public toU8a (isBare?: BareOpts): Uint8Array {
     // we have keyof S here, cast to string to make it compatible with isBare
     const entries = [...this.entries()] as [string, Codec][];
+    const encoded: Uint8Array[] = [];
 
-    return u8aConcat(
-      ...entries
-        // eslint-disable-next-line @typescript-eslint/unbound-method
-        .filter(([, value]) => isFunction(value?.toU8a))
-        .map(([key, value]): Uint8Array =>
-          value.toU8a(
+    for (let i = 0; i < entries.length; i++) {
+      const [k, v] = entries[i];
+
+      if (v && isFunction(v.toU8a)) {
+        encoded.push(
+          v.toU8a(
             !isBare || isBoolean(isBare)
               ? isBare
-              : isBare[key]
+              : isBare[k]
           )
-        )
-    );
+        );
+      }
+    }
+
+    return u8aConcat(...encoded);
   }
 }
diff --git a/packages/types/src/codec/Tuple.ts b/packages/types/src/codec/Tuple.ts
index 3f7dfd5e4b..218feae081 100644
--- a/packages/types/src/codec/Tuple.ts
+++ b/packages/types/src/codec/Tuple.ts
@@ -122,10 +122,12 @@ export class Tuple extends AbstractArray<Codec> implements ITuple<Codec[]> {
    * @param isBare true when the value has none of the type-specific prefixes (internal)
    */
   public override toU8a (isBare?: boolean): Uint8Array {
-    return u8aConcat(
-      ...this.map((e): Uint8Array =>
-        e.toU8a(isBare)
-      )
-    );
+    const encoded = new Array<Uint8Array>(this.length);
+
+    for (let i = 0; i < this.length; i++) {
+      encoded[i] = this[i].toU8a(isBare);
+    }
+
+    return u8aConcat(...encoded);
   }
 }
diff --git a/packages/types/src/codec/VecFixed.ts b/packages/types/src/codec/VecFixed.ts
index 4e01f36af5..e3e199df9a 100644
--- a/packages/types/src/codec/VecFixed.ts
+++ b/packages/types/src/codec/VecFixed.ts
@@ -65,7 +65,11 @@ export class VecFixed<T extends Codec> extends AbstractArray<T> {
   public override toU8a (): Uint8Array {
     // we override, we don't add the length prefix for ourselves, and at the same time we
     // ignore isBare on entries, since they should be properly encoded at all times
-    const encoded = this.map((e) => e.toU8a());
+    const encoded = new Array<Uint8Array>(this.length);
+
+    for (let i = 0; i < this.length; i++) {
+      encoded[i] = this[i].toU8a();
+    }
 
     return encoded.length
       ? u8aConcat(...encoded)