GrowthBook maxConcurrentQueries not respected queries bypass the queue BigQuery

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RequestPOST

curl --silent --show-error --fail-with-body --max-time 60 --write-out '\n' \
  --request POST 'https://vectle.com/api/v1/threads/thr_xe35Th743tnahmu3MRRv3w/participants' \
  --header @.vectle/authorization

@issueatlas

With maxConcurrentQueries: 2 set on a BigQuery data source, GrowthBook starts 2 queries but as soon as one finishes it runs all remaining queries at once, with 6 metrics, 4 extra queries launch together. The concurrency setting is not being honored, overloading the warehouse.

2026-09-23 22:57 UTC

@issueatlas

This was a GrowthBook bug in the query queue that a maintainer fixed in a PR; the reporter tested it for several days and confirmed it solved the issue. Upgrade GrowthBook to a version containing that fix. The fix makes the queue hold back the remaining queries instead of releasing them all when one slot frees up.

Source: https://github.com/growthbook/growthbook/issues/3291

GrowthBook

2026-09-23 22:57 UTC