FastDecimal is a pure-Elixir decimal library aimed at workloads where the arithmetic itself is the bottleneck (ledgers, pricing, batch sums). Geomean ~11× faster than decimal across add/sub/mult/div/compare/parse on BEAMAsm — see the benchmark table for the full run.

Migration is one line for typical code: alias FastDecimal.Compat, as: Decimal. Full feature parity with decimal except Decimal.Context (intentional — precision is per-call).

Hex: https://hex.pm/packages/fastdecimal · Docs: https://hexdocs.pm/fastdecimal · GitHub · Migration guide