Build times are too slow

We have our source code written in TS and we use `haul@1.0.0-rc.7` along with `awesome-typescript-loader` and `babel-loader` for our RN app. The build is too slow for both the first build and when changes are made to a single component. The initial build time is okay, but the incremental changes are too slow for normal use.

```
First build 2m13s71
Change component 0m14s10
Revert change 0m13s12
```

### Current Behavior
The initial build and incremental changes take too long.

### Expected Behavior
The initial build should preferably be fast. Incremental changes need to be considerably faster.

### Haul Configuration (webpack.haul.js)
```js
const path = require('path');

const appDir = path.resolve(__dirname, '..');

const paths = {
appSrc: path.resolve(appDir, 'src'),
nodeModules: path.resolve(appDir, 'node_modules'),
};

module.exports = ({ platform }, { module, resolve }) => {
return {
entry: path.resolve(paths.appSrc, 'index.native.tsx'),

devtool: 'inline-source-map',

module: {
...module,
rules: [
{
test: /\.tsx?$/,
loader: 'awesome-typescript-loader',
options: {
transpileOnly: true,
},
},
{
test: /\.(js|jsx|mjs)$/,
include: [
paths.nodeModules,
],
loader: 'babel-loader',
options: {
compact: true,
},
},
...module.rules,
],
},

resolve: {
...resolve,
extensions: [
`.${platform}.ts`, `.${platform}.tsx`,
'.native.ts', '.native.tsx',
'.ts', '.tsx',
...resolve.extensions,
],
},

};
};

```

### Your Environment

| software | version
| ---------------- | -------
| Haul | 1.0.0-rc.7
| react-native | 0.53.0
| node | 8.4.0
| npm or yarn | 0.27.5

I tried using cache with `awesome-typescript-loader` via `happypack` and `cacheloader`, but it didn't make any noticeable changes. I also verified that `babel-loader` is writing to the disk cache.

Is the build times to be expected or can they be made faster? Any help would be greatly helpful.