Hi @kananindzya, I'm curious about your use case, in which context would you need to create a million of connections? There's virtually no limit to the connection number, you can increase parallelism by tweaking the following env variables:

### APPLICATIONS ###
# Scheduler #
# Relevant to scaling.
SUBMITTER_NUM_THREADS=10

# Worker #
# Relevant to scaling.
MAX_SYNC_WORKERS=5
MAX_SPEC_WORKERS=5
MAX_CHECK_WORKERS=5
MAX_DISCOVER_WORKERS=5

You can find more details about scaling Airbyte here