---
title: "setMaximumPacingRateBytesPerSecond(_:)"
framework: Network
role: symbol
role_heading: Instance Method
platforms: [iOS 27.0+, iPadOS 27.0+, Mac Catalyst 27.0+, macOS 27.0+, tvOS 27.0+, visionOS 27.0+, watchOS 27.0+]
path: "network/nwprotocoltcp/metadata/setmaximumpacingratebytespersecond(_:)"
---

# setMaximumPacingRateBytesPerSecond(_:)

Set the maximum pacing rate for this TCP connection, in bytes per second.

## Declaration

```swift
func setMaximumPacingRateBytesPerSecond(_ maximumPacingRateBytesPerSecond: UInt64?)
```

## Parameters

- `maximumPacingRateBytesPerSecond`: Maximum pacing rate in bytes per second, or nil to disable pacing.

## Discussion

Discussion TCP pacing spreads out packet transmission to avoid bursts and reduce network congestion. The actual on-wire rate is the minimum of this cap and the rate computed from the congestion window and RTT, so this value never increases throughput above what congestion control allows. Pass nil to disable pacing on this connection — the connection will send without pacing (subject only to congestion control).