The launchd service will use only one worker thread. For improved
performance, consider manually starting materialized and tuning the
number of worker threads based on your hardware:
materialized --workers=N

To start materializeinc/materialize/materialized now and restart at login:

brew services start materializeinc/materialize/materialized

Or, if you don't want/need a background service you can just run:

materialized --workers=1

login:
psql -U materialize -h localhost -p 6875 materialize