diff --git a/app.js b/app.js
index 8cacfee..f53cece 100644
--- a/app.js
+++ b/app.js
@@ -38,7 +38,7 @@ const bootstrap = async() => {
     await require('js/mandelbrot.js')(),
     await require('emscripten/mandelbrot.js')(),
     await require('assemblyscript/mandelbrot-asc.js')(),
-    await require('assemblyscript/mandelbrot-tsc.js')(),
+    // await require('assemblyscript/mandelbrot-tsc.js')(),
     await require('asmjs/mandelbrot.js')(),
   ];
 
diff --git a/assemblyscript/mandelbrot-asc.js b/assemblyscript/mandelbrot-asc.js
index 75d4b14..4834c02 100644
--- a/assemblyscript/mandelbrot-asc.js
+++ b/assemblyscript/mandelbrot-asc.js
@@ -1,27 +1,40 @@
-module.exports = async() => {
+module.exports = async () => {
 
-  const WIDTH = 1200, HEIGHT = 800;
+  const WIDTH     = 1200;
+  const HEIGHT    = 800;
+  const PAGE_SIZE = 65536;
+
+  function allocateMemory() {
+    const initial = Math.floor(WIDTH * HEIGHT * 4 / PAGE_SIZE) + 1;
+    return new WebAssembly.Memory({ initial });
+  }
+
+  const imports = {
+    env: {
+      memoryBase: 0,
+      memory: allocateMemory()
+    }
+  };
 
   const res = await fetch('assemblyscript/mandelbrot.wasm');
   const buffer = await res.arrayBuffer();
-  const instance = await WebAssembly.instantiate(buffer, {});
-
-  
+  const module = await WebAssembly.instantiate(buffer, imports);
+  const { mandelbrot, getDataBuffer, memory } = module.instance.exports;
+  let imgData = null;
 
   return {
-    render: (ctx, config) => {
-      console.log(instance.instance.exports.structured());
-      instance.instance.exports.mandelbrot(config.iterations, config.x, config.y, config.d);
+    render: (ctx, { iterations, x, y, d }) => {
+      mandelbrot(iterations, x, y, d);
 
-      const imgData = ctx.createImageData(WIDTH, HEIGHT);
-      const offset = instance.instance.exports.getData();
-      const linearMemory = new Uint8Array(instance.instance.exports.memory.buffer, offset, WIDTH * HEIGHT * 4);
-      for (let i = 0; i < linearMemory.length; i++) {
+      if (!imgData) imgData = ctx.createImageData(WIDTH, HEIGHT);
+      const offset = getDataBuffer();
+      const linearMemory = new Uint8Array(memory.buffer, offset, WIDTH * HEIGHT * 4);
+      for (let i = 0, len = linearMemory.length; i < len; i++) {
         imgData.data[i] = linearMemory[i];
       }
       ctx.putImageData(imgData, 0, 0);
     },
     name: 'AssemblyScript',
     description: 'This implementation uses the AssemblyScript compiler to compile a TypeScript mandelbrot to WebAssembly.'
-  }
+  };
 };
diff --git a/assemblyscript/mandelbrot-tsc.js b/assemblyscript/mandelbrot-tsc.js
index 7f49f55..8d55ac7 100644
--- a/assemblyscript/mandelbrot-tsc.js
+++ b/assemblyscript/mandelbrot-tsc.js
@@ -1,18 +1,24 @@
 const typeScriptMandelbrot = require('./mandelbrot.js');
 
+const WIDTH  = 1200;
+const HEIGHT = 800;
+
+var imgData = null;
+
+const { getData, mandelbrot } = typeScriptMandelbrot;
+
 module.exports = () => Promise.resolve({
-  render: (ctx, config) => {
-    const WIDTH = 1200, HEIGHT = 800;
-  
-    typeScriptMandelbrot.mandelbrot(config.iterations, config.x, config.y, config.d);
-  
-    const imgData = ctx.createImageData(WIDTH, HEIGHT);
-    const linearMemory = typeScriptMandelbrot.getData();
-    for (let i = 0; i < linearMemory.length; i++) {
+  render: (ctx, { iterations, x, y, d }) => {
+    mandelbrot(iterations, x, y, d);
+
+    if (!imgData) imgData = ctx.createImageData(WIDTH, HEIGHT);
+    const linearMemory = getData();
+
+    for (let i = 0, len = linearMemory.length; i < len; i++) {
       imgData.data[i] = linearMemory[i];
     }
     ctx.putImageData(imgData, 0, 0);
   },
   name: 'TypeScript',
   description: 'This implementation takes the TypeScript that is used by AssemblyScript to generate WebAssembly, but instead passes it through the TypeScript compiler to create JavaScript.'
-});
\ No newline at end of file
+});
diff --git a/assemblyscript/mandelbrot.js b/assemblyscript/mandelbrot.js
index 66dd218..c9aabeb 100644
--- a/assemblyscript/mandelbrot.js
+++ b/assemblyscript/mandelbrot.js
@@ -1,23 +1,22 @@
 define(["require", "exports"], function (require, exports) {
     "use strict";
-    exports.__esModule = true;
-    var WIDTH = 1200, HEIGHT = 800;
-    var data = new Uint8Array(1200 * 800 * 4);
+    Object.defineProperty(exports, "__esModule", { value: true });
+    const WIDTH = 1200;
+    const HEIGHT = 800;
+    var data = new Uint8Array(WIDTH * HEIGHT * 4);
     function colour(iteration, offset, scale) {
-        iteration = ((iteration * scale) + offset) % 1024;
+        iteration = (iteration * scale + offset) & 1023;
         if (iteration < 256) {
             return iteration;
         }
         else if (iteration < 512) {
-            return 255 - (iteration - 255);
-        }
-        else {
-            return 0;
+            return (255 - (iteration - 255));
         }
+        return 0;
     }
     function iterateEquation(x0, y0, maxiterations) {
-        var a = 0, b = 0, rx = 0, ry = 0;
-        var iterations = 0;
+        let a = 0.0, b = 0.0, rx = 0.0, ry = 0.0;
+        let iterations = 0;
         while (iterations < maxiterations && (rx * rx + ry * ry <= 4)) {
             rx = a * a - b * b + x0;
             ry = 2 * a * b + y0;
@@ -27,19 +26,22 @@ define(["require", "exports"], function (require, exports) {
         }
         return iterations;
     }
-    function scale(domainStart, domainLength, screenLength, step) {
-        return domainStart + domainLength * ((step - screenLength) / screenLength);
+    // @inline
+    function scale(domainStart, domainLength, invScreenLength, step) {
+        return domainStart + domainLength * (step * invScreenLength - 1.0);
     }
     function mandelbrot(maxIterations, cx, cy, diameter) {
-        var verticalDiameter = diameter * HEIGHT / WIDTH;
-        for (var x = 0; x < WIDTH; x++) {
-            for (var y = 0; y < HEIGHT; y++) {
+        const invWidth = 1.0 / WIDTH;
+        const invHeight = 1.0 / HEIGHT;
+        var verticalDiameter = diameter * HEIGHT * invWidth;
+        for (let x = 0; x < WIDTH; ++x) {
+            for (let y = 0; y < HEIGHT; ++y) {
                 // convert from screen coordinates to mandelbrot coordinates
-                var rx = scale(cx, diameter, WIDTH, x);
-                var ry = scale(cy, verticalDiameter, HEIGHT, y);
-                var iterations = iterateEquation(rx, ry, maxIterations);
-                var idx = ((x + y * WIDTH) * 4);
-                data[idx] = iterations == maxIterations ? 0 : colour(iterations, 0, 4);
+                let rx = scale(cx, diameter, invWidth, x);
+                let ry = scale(cy, verticalDiameter, invHeight, y);
+                let iterations = iterateEquation(rx, ry, maxIterations);
+                let idx = (x + y * WIDTH) << 2;
+                data[idx + 0] = iterations == maxIterations ? 0 : colour(iterations, 0, 4);
                 data[idx + 1] = iterations == maxIterations ? 0 : colour(iterations, 128, 4);
                 data[idx + 2] = iterations == maxIterations ? 0 : colour(iterations, 356, 4);
                 data[idx + 3] = 255;
@@ -51,5 +53,9 @@ define(["require", "exports"], function (require, exports) {
         return data;
     }
     exports.getData = getData;
+    function getDataBuffer() {
+        return (data.buffer);
+    }
+    exports.getDataBuffer = getDataBuffer;
     ;
 });
diff --git a/assemblyscript/mandelbrot.ts b/assemblyscript/mandelbrot.ts
index b86f24b..92cd230 100644
--- a/assemblyscript/mandelbrot.ts
+++ b/assemblyscript/mandelbrot.ts
@@ -1,5 +1,9 @@
-const WIDTH: f64 = 1200, HEIGHT: f64 = 800;
-const data: Uint8Array = new Uint8Array(1200 * 800 * 4);
+import "allocator/arena";
+
+const WIDTH:  i32 = 1200;
+const HEIGHT: i32 = 800;
+
+var data: Uint8Array = new Uint8Array(WIDTH * HEIGHT * 4);
 
 function colour(iteration: i32, offset: i32, scale: i32): u8 {
   iteration = ((iteration * scale) + offset) % 1024;
@@ -7,14 +11,13 @@ function colour(iteration: i32, offset: i32, scale: i32): u8 {
     return iteration as u8;
   } else if (iteration < 512) {
     return 255 - ((iteration as u8) - 255);
-  } else {
-    return 0;
-  }
+  } 
+  return 0;
 }
 
 function iterateEquation(x0: f64, y0: f64, maxiterations: i32): i32 {
-  let a: f64 = 0, b: f64 = 0, rx: f64 = 0, ry: f64 = 0;
-  let iterations: i32 = 0;
+  let a = 0.0, b = 0.0, rx = 0.0, ry = 0.0;
+  let iterations = 0;
   while (iterations < maxiterations && (rx * rx + ry * ry <= 4)) {
     rx = a * a - b * b + x0;
     ry = 2 * a * b + y0;
@@ -25,27 +28,33 @@ function iterateEquation(x0: f64, y0: f64, maxiterations: i32): i32 {
   return iterations;
 }
 
+@inline
 function scale(domainStart: f64, domainLength: f64, screenLength: f64, step: f64): f64 {
   return domainStart + domainLength * ((step - screenLength) / screenLength);
 }
 
 export function mandelbrot(maxIterations: i32, cx: f64, cy: f64, diameter: f64): void {
-  const verticalDiameter: f64 = diameter * HEIGHT / WIDTH;
-  for (var x: f64 = 0; x < WIDTH; x++) {
-    for (var y: f64 = 0; y < HEIGHT; y++) {
+  let verticalDiameter: f64 = diameter * HEIGHT / WIDTH;
+  for (let x = 0; x < WIDTH; ++x) {
+    for (let y = 0; y < HEIGHT; ++y) {
       // convert from screen coordinates to mandelbrot coordinates
-      const rx: f64 = scale(cx, diameter, WIDTH, x);
-      const ry: f64 = scale(cy, verticalDiameter, HEIGHT, y);
-      const iterations: i32 = iterateEquation(rx, ry, maxIterations);
-      const idx: i32 = ((x + y * (WIDTH as f64)) * 4) as i32;
-      data[idx] = iterations == maxIterations ? 0 : colour(iterations, 0, 4);
-      data[idx + 1] = iterations == maxIterations ? 0 : colour(iterations, 128, 4);
-      data[idx + 2] = iterations == maxIterations ? 0 : colour(iterations, 356, 4);
-      data[idx+3] = 255;
+      let rx = scale(cx, diameter, WIDTH,  x);
+      let ry = scale(cy, verticalDiameter, HEIGHT, y);
+      let iterations = iterateEquation(rx, ry, maxIterations);
+      let idx = (x + y * WIDTH) << 2;
+
+      unchecked(data[idx + 0] = iterations == maxIterations ? 0 : colour(iterations, 0,   4));
+      unchecked(data[idx + 1] = iterations == maxIterations ? 0 : colour(iterations, 128, 4));
+      unchecked(data[idx + 2] = iterations == maxIterations ? 0 : colour(iterations, 356, 4));
+      unchecked(data[idx + 3] = 255);
     }
   }
 }
 
 export function getData(): Uint8Array {
   return data;
+}
+
+export function getDataBuffer(): ArrayBuffer {
+  return <ArrayBuffer>(data.buffer);
 };
diff --git a/assemblyscript/mandelbrot.wasm b/assemblyscript/mandelbrot.wasm
index fd83cb5..a154a5d 100644
Binary files a/assemblyscript/mandelbrot.wasm and b/assemblyscript/mandelbrot.wasm differ
diff --git a/assemblyscript/package.json b/assemblyscript/package.json
index 09e0211..e883084 100644
--- a/assemblyscript/package.json
+++ b/assemblyscript/package.json
@@ -5,13 +5,15 @@
   "main": "index.js",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1",
-    "build-tsc": "tsc",
-    "build-asc": "asc -O3 mandelbrot.ts -o mandelbrot.wasm"
+    "build-tsc": "npx tsc",
+    "build-asc": "npx asc mandelbrot.ts -b mandelbrot.wasm -t mandelbrot.wat -O3 --validate --noDebug --noAssert --use abort=",
+    "build": "npm run build-asc && npm run build-tsc"
   },
   "author": "ceberhardt@scottlogic.com",
   "license": "ISC",
   "dependencies": {
-    "assemblyscript": "^0.3.0",
-    "typescript": "^2.5.3"
+    "assemblyscript": "github:AssemblyScript/assemblyscript",
+    "glob": "^7.1.2",
+    "typescript": "^2.9.2"
   }
 }
diff --git a/assemblyscript/tsconfig.json b/assemblyscript/tsconfig.json
index 0c00e91..3a41d14 100644
--- a/assemblyscript/tsconfig.json
+++ b/assemblyscript/tsconfig.json
@@ -1,9 +1,10 @@
 {
-  "extends": "./node_modules/assemblyscript/tsconfig.assembly.json",
+  "extends": "./node_modules/assemblyscript/std/assembly.json",
   "include": [
-    "./*.ts"
+    "./**/*.ts"
   ],
   "compilerOptions": {
+    "target": "es6",
     "module": "amd"
   }
 }