fun/web/documentation/performance/performance.md

layout	published	noToc	noComments	noDate	title	subtitle	description	permalink	lang	tags
page	true	false	false	false	Fun - Performance Guide	Build/runtime tuning tips and patterns for better performance.	Build/runtime tuning tips and patterns for better performance.	/documentation/performance/	en	better build patterns performance runtime tips tuning

Tips for getting good performance from Fun programs and builds.

Build configuration

• Use -DCMAKE_BUILD_TYPE=Release for production binaries.
• Consider FUN_DEBUG=OFF to remove extra checks in hot paths.
• FUN_USE_MUSL=ON can help with static/portable builds; measure performance for your use case.

Language-level tips

• Prefer pre-sized arrays/maps when possible to reduce reallocations.
• Avoid unnecessary string concatenations in loops; accumulate in arrays and join.
• Push work to native ops where available (e.g., regex, JSON, math helpers).

Algorithmic choices

• Choose appropriate data structures (arrays for ordered scans, maps for key lookups).
• Cache repeated computations or lookups when safe.

Measuring

• Create small, representative benchmarks.
• Compare Debug vs. Release to ensure changes are meaningful.