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I'm interested in learning more about how to optimize JavaScript programs. Do you know of any good examples or other resources in this area?

• leeoniya 4y ago
  nothing specific, just do a google search. generally i think advice that will always be applicable: - learn and use a profiler before there are performance issues, not after (dont treat performance as an afterthought). - internalize which patterns are faster and which are slower, and when it matters. - for any runtime with a GC, reduce repetitive memory allocation and GC pressure. prefer shallow structures. mutation instead of immutability (thus, mem allocation). - cache/memoize whenever possible. - don't use algorithms that scale poorly with data size. finally, beware of following any performance advice older than 6 months; JITs advance constantly, so make sure to re-bench/measure continuously to avoid doing unnecessary refactors, and test with real code; there are lies, damned lies, and micro-benchmarks.