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Test Manager user guide

Last updated Mar 24, 2026

Known limitations for performance testing

Execution duration limits

Cloud, serverless robots can run for a maximum of 60 minutes per test. On-premises robots can exceed this limit.

Concurrency limits

  • Maximum concurrent jobs:

    Up to 500 jobs can run concurrently using serverless robots.

  • Impact on virtual users (VUs):

    The number of achievable virtual users depends on multiplexing (multiple VUs per job).

    For example, with a multiplexing factor of 4, a scenario can scale up to 2,000 concurrent virtual users.

    The multiplexing capabilities for serverless robots are automatically detected during the dry run, and the resulting factor is reported in the application logs.

    Unlike on-premises machines, where the multiplexing factor can be manually overridden, this is not supported for serverless robots.

  • VPN constraints:

    When using a VPN, the effective concurrency depends on the VPN or gateway capacity.

    • Default limit: ~250 concurrent jobs

    • The actual limit may vary based on the gateway SKU and infrastructure capacity.

    • If higher concurrency is required, customers should contact UiPath support or their account team to discuss VPN scaling options.

  • Execution duration:

    Serverless robots are limited to 60 minutes per execution

Supported automation types

Performance testing is currently limited to Browser, API (HTTP WebRequest), and Desktop automations. For example, Integration Service or coded automations are not yet supported.

Additional limitations

  • Infrastructure gaps: ACR-VM support and elastic provisioning are not yet available, so automatic scaling of resources is currently not possible.
  • API access: Direct programmatic access to raw performance test data is not yet supported.
  • Historical comparison: Test results from different historical runs cannot yet be compared.
  • Autopilot and agentic support: Autopilot and agentic support are not available in the current release.
  • Recordings displayed in the detail: Recording can be activated and viewd only in Orchestrator.

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