# Journey Builder throughput and performance best practices

*Marketing Cloud Engagement Specialist Study Guide · Marketing Automation · Last updated October 29, 2026 · https://www.certifyforce.com/study-guide/marketing-cloud-engagement-specialist/marketing-automation/journey-builder-throughput-and-performance-best-practices*

How to keep journeys fast: stagger starts and use High-Throughput Sending, pre-filter large audiences in Automation Studio, write cheap entry filters, use journey data in splits, understand how segments set the pace, and place waits, Decision Splits and heavy personalization carefully.

- Certification: Salesforce Marketing Cloud Engagement Specialist
- Exam section: Marketing Automation
- Study guide: https://www.certifyforce.com/study-guide/marketing-cloud-engagement-specialist

**Official exam objective:**

> Given a customer scenario, recommend the appropriate marketing automation solution.

## What the exam expects

- Recommend staggered start times and High-Throughput Sending (HTS) when concurrent journeys run slowly.
- Move large-scale filtering out of the entry source into Automation Studio, and write entry filters with cheap operators.
- Use journey data rather than one-to-many contact data in Decision Splits.
- Explain how journey segments set processing speed, and place waits and Decision Splits by the guidance.
- Explain the throughput cost of heavy personalization.
- Key terms: **segment** (the chain of activities between the start, waits and the exit); **HTS** (High-Throughput Sending for email, set per journey); **entry filter** (criteria on the entry source that decide who is admitted); **journey data** (values captured from the entry source at entry); **contact data** (attributes reached through the contact model).

## Key facts

| Fact | Detail | Source |
|---|---|---|
| Baseline throughput | Up to two million email sends per hour per tenant | [Optimize Journey Builder Performance](https://help.salesforce.com/s/articleView?id=mc_bp_journey_builder_best_practices.htm&language=en_US&type=5) |
| HTS | Two times or more throughput; can't be turned off in a journey once activated | [Journey Settings](https://help.salesforce.com/s/articleView?id=mktg.mc_jb_journey_settings.htm&language=en_US&type=5) |
| Large entry filters | Not over 50% of contacts when over 500,000 total | [Optimize Journey Builder Performance](https://help.salesforce.com/s/articleView?id=mc_bp_journey_builder_best_practices.htm&language=en_US&type=5) |
| Filter operators | Avoid contains and ends with; equals is cheaper | [Optimize Journey Builder Performance](https://help.salesforce.com/s/articleView?id=mc_bp_journey_builder_best_practices.htm&language=en_US&type=5) |
| Split data | Use journey data from the entry source | [Optimize Journey Builder Performance](https://help.salesforce.com/s/articleView?id=mc_bp_journey_builder_best_practices.htm&language=en_US&type=5) |
| Segment speed | Set by the slowest activity in it | [Optimize Journey Builder Performance](https://help.salesforce.com/s/articleView?id=mc_bp_journey_builder_best_practices.htm&language=en_US&type=5) |
| Activities per journey | No limit; keep to 150-200 | [Optimize Journey Builder Performance](https://help.salesforce.com/s/articleView?id=mc_bp_journey_builder_best_practices.htm&language=en_US&type=5) |
| Short mid-journey wait | 3 minutes or less ignored without exit criteria or a goal with exit criteria | [Optimize Journey Builder Performance](https://help.salesforce.com/s/articleView?id=mc_bp_journey_builder_best_practices.htm&language=en_US&type=5) |
| Wait by Duration default | 1 day | [Wait Activities in Journey Builder](https://help.salesforce.com/s/articleView?id=mktg.mc_jb_wait_activity.htm&language=en_US&type=5) |
| Advanced personalization | Up to 25% lower send throughput | [Optimize Journey Builder Performance](https://help.salesforce.com/s/articleView?id=mc_bp_journey_builder_best_practices.htm&language=en_US&type=5) |

## Check yourself

- Why give each journey its own pre-filtered, sendable copy of a data extension?
- When should you ask your account executive about performance?
- Which tool shows the journeys and configurations that slow overall processing?
- How many Decision Splits at most should a journey start with if it needs any?

## Sources

- [How to Optimize Journey Builder Performance](https://help.salesforce.com/s/articleView?id=mc_bp_journey_builder_best_practices.htm&language=en_US&type=5)
- [Wait Activities in Journey Builder](https://help.salesforce.com/s/articleView?id=mktg.mc_jb_wait_activity.htm&language=en_US&type=5)
- [Journey Settings](https://help.salesforce.com/s/articleView?id=mktg.mc_jb_journey_settings.htm&language=en_US&type=5)
- [Entry Sources](https://help.salesforce.com/s/articleView?id=mc_jb_entry_sources.htm&language=en_US&type=5)

## About the full unit

The "Core concepts", "Exam traps" and "Worked scenario" sections of this unit, its 8 linked practice questions, and unlimited timed mock exams are included with the Marketing Cloud Engagement Specialist pack (USD $19): https://www.certifyforce.com/practice-exams