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Maintenance Working Memory

The default Postgres maintenance_work_mem value of 64MB is quite conservative and can slow down parallel index builds. We recommend at least 64MB per parallel worker.
postgresql.conf
maintenance_work_mem = 16GB
Each worker is required to have at least 15MB memory. If maintenance_work_mem is set too low, an error will be returned.

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Parallel Indexing Workers

ParadeDB uses Postgres’ max_parallel_maintenance_workers setting to determine the degree of parallelism during CREATE INDEX/REINDEX. Postgres’ default is 2, which may be too low for large tables. 
SET max_parallel_maintenance_workers = 8;
In order for max_parallel_maintenance_workers to take effect, it must be less than or equal to both max_parallel_workers and max_worker_processes.