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---
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stage: Systems
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group: Geo
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info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/product/ux/technical-writing/#assignments
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type: howto
---
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# Tuning Geo **(PREMIUM SELF)**
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You can limit the number of concurrent operations the sites can run
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in the background.
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## Changing the sync/verification concurrency values
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On the **primary** site:
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1. On the top bar, select **Main menu > Admin** .
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1. On the left sidebar, select **Geo > Sites** .
1. Select **Edit** of the secondary site you want to tune.
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1. Under **Tuning settings** , there are several variables that can be tuned to
improve the performance of Geo:
- Repository synchronization concurrency limit
- File synchronization concurrency limit
- Container repositories synchronization concurrency limit
- Verification concurrency limit
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Increasing the concurrency values increases the number of jobs that are scheduled.
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However, this may not lead to more downloads in parallel unless the number of
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available Sidekiq threads is also increased. For example, if repository synchronization
concurrency is increased from 25 to 50, you may also want to increase the number
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of Sidekiq threads from 25 to 50. See the
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[Sidekiq concurrency documentation ](../../sidekiq/extra_sidekiq_processes.md#concurrency )
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for more details.
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## Repository re-verification
See
[Automatic background verification ](../disaster_recovery/background_verification.md ).
