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← A profiler measures time already spent in an operation, not how much time would be saved by optimizing it.

13 connected korrents · 13 moments from 11 Oct 2020 to 12 Oct 2026. Nearly all of them are about software performance.

Everything filed under developer tools developer tools Everything filed under coding agents coding agents Everything filed under compilers compilers Everything filed under Python Python Same subjectSame subjectSame subjectSame subjectSame subjectSame subjectSame subjectSame subjectSame subjectSame subjectSame subjectSame subjectSame subject Read this korrent: A profiler measures time already spent in an operation, not how much time would be saved by optimizing it. A profiler measures time already spent inan operation, not how much time would besaved by optimizing it. Last stated 3 years ago 18 Dec 2023 NE Nelson Elhage — holds since 2023-12-18 — tap for who they are Same subject: Profilers show where time is spent but not which of that time can feasibly be reduced or is worth optimizing. — tap to centre the map on it Profilers show where time is spentbut not which of that time canfeasibly be reduced or is worthoptimizing. Last stated 3 years ago 18 Dec 2023 NE Nelson Elhage — holds since 2023-12-18 — tap for who they are Same subject: Sampling profilers are very low overhead and can provide deep insight into running systems without needing to instrument them first. — tap to centre the map on it Sampling profilers are very lowoverhead and can provide deepinsight into running systems withoutneeding to instrument them first. Last stated 3 weeks ago 12 Oct 2026 SW Simon Willison — holds since 2026-10-12 — tap for who they are Same subject: Optimization means measuring the gap between your code and what the hardware could theoretically do, not making changes and checking whether the statistics improved. — tap to centre the map on it Optimization means measuring the gapbetween your code and what thehardware could theoretically do, notmaking changes and checking whetherthe statistics improved. Last stated 2 months ago 26 Aug 2026 CM Casey Muratori — holds since 2026-08-26 — tap for who they are Same subject: When diagnosing a performance problem, starting with a CPU profile is more useful than checking database queries first. — tap to centre the map on it When diagnosing a performanceproblem, starting with a CPU profileis more useful than checkingdatabase queries first. Last stated 4 months ago 21 Jul 2026 JE Julia Evans — holds since 2026-07-21 — tap for who they are Same subject: "I don't know" becomes a kind of superpower when you can work with Claude Code to figure things out. — tap to centre the map on it "I don't know" becomes a kind ofsuperpower when you can work withClaude Code to figure things out. Last stated 8 months ago 19 Mar 2026 KP Kris Puckett — holds since 2026-03-19 — tap for who they are Same subject: A code-review agent works best with a clean context, sharing nothing with the coding agent beforehand. — tap to centre the map on it A code-review agent works best witha clean context, sharing nothingwith the coding agent beforehand. Last stated 6 months ago 22 Apr 2026 WY Walden Yan — holds since 2026-04-22 — tap for who they are Same subject: A coding agent does not learn from its mistakes the way a person does -- it repeats the same error indefinitely unless a human notices and writes it down. — tap to centre the map on it A coding agent does not learn fromits mistakes the way a person does-- it repeats the same errorindefinitely unless a human noticesand writes it down. Last stated 7 months ago 25 Mar 2026 MZ Mario Zechner — holds since 2026-03-25 — tap for who they are Same subject: A compiler that names every place a change breaks turns refactoring into fixing errors until the compiler stops shouting. — tap to centre the map on it A compiler that names every place achange breaks turns refactoring intofixing errors until the compilerstops shouting. Last stated 6 months ago 20 May 2026 AR Alice Ryhl — holds since 2026-05-20 — tap for who they are Same subject: A programming language is not a compiler but an experience: editing, running, debugging and the runtime library all have to fit together as one cycle. — tap to centre the map on it A programming language is not acompiler but an experience: editing,running, debugging and the runtimelibrary all have to fit together asone cycle. Last stated 6 months ago 13 May 2026 AH Anders Hejlsberg — holds since 2026-05-13 — tap for who they are Same subject: A speed difference between languages that share the LLVM backend measures the benchmark author, not the languages. — tap to centre the map on it A speed difference between languagesthat share the LLVM backend measuresthe benchmark author, not thelanguages. Last stated 2 years ago 22 Mar 2025 TH ThePrimeagen — holds since 2025-03-22 — tap for who they are Same subject: A language can keep changing without a Python-2-to-3 break, as long as code written under the old and the new rules can be mixed freely in one program. — tap to centre the map on it A language can keep changing withouta Python-2-to-3 break, as long ascode written under the old and thenew rules can be mixed freely in oneprogram. Last stated 6 months ago 20 May 2026 AR Alice Ryhl — holds since 2026-05-20 — tap for who they are Same subject: Certain programming languages are better suited for agents because strong types and annotations help models understand intent. — tap to centre the map on it Certain programming languages arebetter suited for agents becausestrong types and annotations helpmodels understand intent. Last stated 8 months ago 8 Mar 2026 RC Rui Carmo — holds since 2026-03-08 — tap for who they are Same subject: Kubernetes is an essential skill for data scientists and ML engineers to learn — tap to centre the map on it Kubernetes is an essential skill fordata scientists and ML engineers tolearn Last stated 5 years ago 13 Sept 2021 CH Chip Huyen — holds since 2020-10-11 — tap for who they are CH Chip Huyen — no longer holds since 2021-09-13 — tap for who they are
same subject or similar wordinga cloud: claims about one subject, named for itbar: when it was last stated, on a scale from 2015 to today — full is todaya face: someone who holds the claim — tap it for who they arefaded, dashed ring: they no longer hold it — they changed their mind

At the centre A profiler measures time already spent in an operation, not how much time would be saved by optimizing it. Last stated 18 Dec 2023 · 3 years ago Holds Nelson Elhage Read this korrent →