Performance

Queries are effectively instant after atb fetch builds the indexes.

Query type	Time	Peak RAM
Metadata query (atb query --species ... --limit 100)	<10ms	15 MB
Sample info (atb info SAMN...)	<10ms	14 MB
AMR query (atb amr --species ... --limit 100)	<10ms	0.1 MB
AMR query (atb amr --species ... --class ...)	<10ms	0.1 MB
AMR cross-genus gene search (atb amr --gene ... --limit 100)	~2ms	3 MB
Genome download (50 files, parallel=4)	3.8s	18 MB

Post-fetch index build: ~8-11 minutes (one-time). Disk: ~35 GB for the default install (core parquet + per-genus AMR indexes); skip amrfinderplus.parquet via --tables if you don't need AMR queries.

Full benchmark details, methodology, and comparisons across query tiers: docs/BENCHMARKS.md

See also: Fetching & indexing data for the one-time setup that enables these query speeds.