diff --git a/assembly/custom/itoa.ts b/assembly/custom/itoa.ts
new file mode 100644
index 0000000..d3f5981
--- /dev/null
+++ b/assembly/custom/itoa.ts
@@ -0,0 +1,41 @@
+const f1_10000 = 26844;
+
+@inline export function itoa_fast(out: usize, val: u32): void {
+  const low = val % 100000;
+  const high = val / 100000;
+
+  let tmp_high = high * (f1_10000) - (high / 4);
+  let tmp_low = low * (f1_10000) - (low / 4);
+
+  const h1 = 48 + (tmp_high >> 28);
+  tmp_high = (tmp_high & 0x0fffffff) * 5;
+
+  const h2 = 48 + (tmp_high >> 27);
+  tmp_high = (tmp_high & 134217727) * 5;
+
+  const h3 = 48 + (tmp_high >> 26);
+  tmp_high = (tmp_high & 67108863) * 5;
+
+  const h4 = 48 + (tmp_high >> 25);
+  tmp_high = (tmp_high & 33554431) * 5;
+
+  const h5 = 48 + (tmp_low >> 24);
+
+  const l1 = 48 + (tmp_low >> 28);
+  tmp_low = (tmp_low & 0x0fffffff) * 5;
+
+  const l2 = 48 + (tmp_low >> 27);
+  tmp_low = (tmp_low & 134217727) * 5;
+
+  const l3 = 48 + (tmp_low >> 26);
+  tmp_low = (tmp_low & 67108863) * 5;
+
+  const l4 = 48 + (tmp_low >> 25);
+  tmp_low = (tmp_low & 33554431) * 5;
+
+  const l5 = 48 + (tmp_low >> 24);
+
+  store<v128>(out, i32x4(h1 | (h2 << 16), h3 | (h4 << 16), h5 | (l1 << 16), l2 | (l3 << 16)));
+  store<u32>(out, l4 | (l5 << 16), 16);
+
+}
\ No newline at end of file
diff --git a/assembly/serialize/string.ts b/assembly/serialize/string.ts
index b499700..0911785 100644
--- a/assembly/serialize/string.ts
+++ b/assembly/serialize/string.ts
@@ -11,12 +11,17 @@ import { OBJECT, TOTAL_OVERHEAD } from "rt/common";
 import { bs } from "../custom/bs";
 import { _intTo16, intTo16 } from "../custom/util";
 
+
 // @ts-ignore: Decorator valid here
 @inline export function serializeString(data: string): string {
+    return bs.out<string>();x
+}
+// @ts-ignore: Decorator valid here
+@inline export function serializeString_BS(data: string): void {
     const len = data.length << 1;
     if (len === 0) {
         bs.write_32(2228258); /* "" */
-        return bs.out<string>();
+        return;
     }
 
     bs.write_16(QUOTE);
@@ -80,5 +85,4 @@ import { _intTo16, intTo16 } from "../custom/util";
     }
     bs.write_s_se_u(<string>data, last, changetype<OBJECT>(changetype<usize>(data) - TOTAL_OVERHEAD).rtSize);
     bs.write_16(QUOTE);
-    return bs.out<string>();
 }
\ No newline at end of file
diff --git a/assembly/test.ts b/assembly/test.ts
index 3087d80..94a5005 100644
--- a/assembly/test.ts
+++ b/assembly/test.ts
@@ -1,14 +1,5 @@
-// import { JSON } from ".";
-import { JSON } from ".";
+import { itoa_fast } from "./custom/itoa";
 
-@json
-class ContentBlock {
-  @omitnull()
-  input: JSON.Raw | null = null;
-}
-
-const foo: ContentBlock = {
-  input: "123"
-}
-
-console.log(JSON.stringify(foo))
\ No newline at end of file
+const out = changetype<usize>(new ArrayBuffer(40));
+itoa_fast(out, 1234567890);
+console.log(String.UTF16.decodeUnsafe(out, 20));
\ No newline at end of file
diff --git a/bench/benchmark.ts b/bench/benchmark.ts
index 4f5db48..43c7bcd 100644
--- a/bench/benchmark.ts
+++ b/bench/benchmark.ts
@@ -1,6 +1,8 @@
 import { bench } from "as-bench/assembly/bench";
 import { serializeString } from "../assembly/serialize/string";
 import { bs } from "../assembly/custom/bs";
+import { itoa_fast } from "../assembly/custom/itoa";
+import { itoa_buffered } from "util/number";
 
 @json
 class Vec3 {
@@ -20,13 +22,21 @@ const vec: Vec3 = {
   y: 1,
   z: 8,
 };
-bench("Stringify Vec3", () => {
-  vec.__SERIALIZE_BS();
-  //bs.reset()
-});
-bench("Stringify String", () => {
-  serializeString("Hello World");
+
+bench("itoa fast", () => {
+    itoa_fast(out, 1234567890)
 });
+
+bench("itoa", () => {
+    itoa_buffered(out, 1234567890)
+})
+// bench("Stringify Vec3", () => {
+//   vec.__SERIALIZE_BS();
+//   //bs.reset()
+// });
+// bench("Stringify String", () => {
+//   serializeString("Hello World");
+// });
 /*
 bench("Parse Number SNIP", () => {
     blackbox<i32>(snip_fast<i32>("12345"));
diff --git a/bench/benchmark.wasm b/bench/benchmark.wasm
index d5fba6d..5d7004d 100644
Binary files a/bench/benchmark.wasm and b/bench/benchmark.wasm differ
diff --git a/package.json b/package.json
index 602c7ae..2b2b338 100644
--- a/package.json
+++ b/package.json
@@ -17,7 +17,7 @@
   "scripts": {
     "test": "ast test && rm -rf ./build/",
     "pretest": "rm -rf ./build/ && ast build",
-    "build:test": "rm -rf ./build/ && JSON_DEBUG=true asc assembly/test.ts --transform ./transform -o ./build/test.wasm",
+    "build:test": "rm -rf ./build/ && JSON_DEBUG=true asc assembly/test.ts --transform ./transform -o ./build/test.wasm --enable simd",
     "build:bench": "asc bench/benchmark.ts -o bench/benchmark.wasm --transform ./transform --optimizeLevel 3 --shrinkLevel 0 --converge --noAssert --uncheckedBehavior always --runtime stub --enable simd",
     "bench:wasmtime": "wasmtime ./bench/benchmark.wasm",
     "bench:wasmer": "wasmer --llvm ./bench/benchmark.wasm",