---
title: How Traffic Stabilization works
description: Understand what “Stabilize Traffic” does in Parallel tests and what it is designed to prevent.
---
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# How Traffic Stabilization works
### How Traffic Stabilization works
Traffic stabilization is designed to keep Parallel tests fair when Apple Ads distributes traffic unevenly across variants.
This article explains what **Stabilize Traffic** does, when it applies, and what rules the system follows. To learn how Parallel tests work overall, learn [**what is the Parallel method in CPP A/B Testing**](https://helpcenter.mobileaction.co/en/what-is-the-parallel-method-in-cpp-a-b-testing?hsLang=en).
### Why Traffic Stabilization is useful
In a Parallel test, multiple ads run at the same time and share identical properties.
Because traffic distribution cannot be directly controlled, Apple Ads may favor one variant and allocate most of the traffic (impressions) to it, which can bias the test outcome.
To help prevent this, CPP A/B Testing provides the **Stabilize Traffic** option for the one ad group, multiple custom product pages Parallel test option.
#### How “Stabilize Traffic” works
When **Stabilize Traffic** is enabled:
- The system monitors each variant’s traffic **hourly**.
- If one variant starts receiving disproportionately high traffic, it is **temporarily paused**.
- Pausing continues until other variants catch up.
This feature ensures all variants receive more balanced exposure, so results are more accurate and reliable. However, if your priority is to keep all variants live at all times, you may want to disable this option when running a Parallel test.
#### The 25% traffic distribution rule
The system aims to keep the difference in traffic distribution between:
- The variant receiving the **most** traffic, and
- The variant receiving the **least** traffic
within **25%**.
This monitoring-and-pausing approach is intended to maintain fair distribution with minimal status changes.
#### When traffic stabilization applies
Traffic stabilization only applies in [**single ad group Parallel test,**](https://helpcenter.mobileaction.co/en/create-a-single-ad-group-parallel-test-for-cpp-a-b-testing?hsLang=en) where multiple variants run at the same time, and traffic distribution can become uneven.
### Related links
- [**What is the Parallel method in CPP A/B Testing**](https://helpcenter.mobileaction.co/en/what-is-the-parallel-method-in-cpp-a-b-testing?hsLang=en)
- [**Create a multiple ad group Parallel test for CPP A/B Testing**](https://helpcenter.mobileaction.co/en/create-a-multiple-ad-group-parallel-test-for-cpp-a-b-testing?hsLang=en)
- [What are the requirements and limits for CPP A/B Testing](https://helpcenter.mobileaction.co/en/what-are-the-requirements-and-limits-for-cpp-a-b-testing?hsLang=en)
- [**How do you monitor and interpret tests in CPP A/B Testing**](https://helpcenter.mobileaction.co/en/how-to-monitor-cpp-a-b-tests-in-the-dashboard?hsLang=en)
---
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