---
title: "SpeedBudget"
description: "the budget of one speed of the preview: units and time"
section: concepts
address: /concepts/speedbudget
contract: 0476e35e6e275db5
---

# SpeedBudget

the budget of one speed of the preview: units and time

[figure: SpeedBudget is a value at none scope. The drawing shows its fields and the objects that they point at.]

| property | value |
|---|---|
| kind | value |
| scope | none |
| key | none |
| store | none |
| family | rules_engine |



## Fields


| field | type | required | note |
|---|---|---|---|
| `units` | `count` | yes | the units the speed may read before it answers partial |
| `time_ms` | `count` | yes | the time it may take, in milliseconds |
| `sample` | `count` | no | the units a preview shows as its sample; twelve when absent |



## Routes that use it
No route takes or returns SpeedBudget directly. The record holds it, and the objects that point at it reach it.