# Runtime & Performance

## Overview

Ox runs on portable JavaScript cryptography by default and lets performance-sensitive
applications opt into faster backends. Install a WASM or Node.js [`Engine`](/api/Engine) to
accelerate cryptography without changing calling code, create an independently owned WASM KZG
instance for blobs and PeerDAS, and manage Ox's global caches and bundle footprint.

```ts twoslash
import { Engine, Hash } from 'ox/wasm'

await Engine.install()

const digest = Hash.keccak256('0xdeadbeef')
```

<Cards>
  <Card icon="lucide:database" title="Caching & Bundle Size" description="Clear and tune Ox's global caches, and keep application bundles small." to="/guides/runtime/caches-bundle" />

  <Card icon="lucide:cpu" title="WASM & Engines" description="Choose between Ox's default, WASM, Node, and custom cryptography engines." to="/guides/runtime/engines" />

  <Card icon="lucide:box" title="WASM KZG" description="Create and dispose an owned KZG instance for blobs and PeerDAS." to="/guides/runtime/kzg" />
</Cards>