---
type: reference
---

## Minimize Serialization at RSC Boundaries

### Impact
High

#### Impact Description
Reduces data transfer size

### Tags
- server
- rsc
- serialization
- props

### Description
The React Server/Client (RSC) boundary serializes all object properties into strings and embeds them in the HTML response and subsequent RSC requests. This serialized data directly impacts page weight and load time, so **size matters a lot**. Only pass fields that the client actually uses.

#### Incorrect (serializes all 50 fields):
```tsx
async function Page() {
  const user = await fetchUser()  // 50 fields
  return <Profile user={user} />
}

'use client'
function Profile({ user }: { user: User }) {
  return <div>{user.name}</div>  // uses 1 field
}
```

#### Correct (serializes only 1 field):
```tsx
async function Page() {
  const user = await fetchUser()
  return <Profile name={user.name} />
}

'use client'
function Profile({ name }: { name: string }) {
  return <div>{name}</div>
}
```

[source: skills/react-best-practices/rules/server-serialization.md]