Performance

Run benchmarks

pnpm benchmark:json

This generates benchmarks/latest.json.

Current baseline

• singleSheet_25kRows: ~372ms average
• multiSheet_3x12kRows: ~423ms average

What is measured

• wall-clock time (avgMs, maxMs)
• average heap delta (avgMemBytes)

Guidance

• Prefer explicit columns for predictable shape and faster mapping.
• Use mode: "buffer" for server workloads.
• Split ultra-large exports into multiple sheets to improve operability.